Installation for venting the interior space of a motor vehicle

Claim 2

An installation for ventilating the interior space of a passenger motor vehicle which includes air inlet and air discharge aperture means terminating in the atmosphere, at least one fresh air channel means leading from the air inlet aperture means into the interior space, fan means and at least one air filter insert means arranged in the fresh air channel means and adapted to be traversed by fresh air for filtering at least one of mechanical and chemical air contaminations, characterized in that at least one air channel means is extended along a space means accessible by way of a large continuous surface means, said one air channel means being enlarged within the area of this space means in a housing-like manner for receiving the air filter insert means and being provided with an opening means for the exchange of the air filter insert means, said opening means being of relatively large surface and adapted to be closed, a heat-exchanger for preheating the fresh air in the fresh air channel means is arranged upstream of the air filter insert means, as viewed in the flow direction, and in that a recirculating line means terminates in the fresh air channel means downstream of the air filter insert means, as viewed in the flow direction.

Claim 3

An installation according to claim 1, characterized in that the air filter insert means is of one-piece construction.

Claim 4

An installation according to claim 1, characterized in that the air filter insert means is of multi-partite construction.

Claim 5

An installation according to claim 1, characterized in that said space means is a hollow space.

Claim 6

An installation according to claim 1, characterized in that said space means is a free space.

Claim 7

An installation according to claim 1, characterized in that said space means is located below the hat storage surface disposed underneath the rear window of the vehicle.

Claim 8

An installation according to claim 1, characterized in that interchangeable means for a moisture removal are arranged in the recirculating line means and are traversed by the recirculating air.

Claim 9

An installation according to claim 7, characterized in that a variable throttle means at least partly closing the flow cross section is provided at least in one of the two channel means consisting of the fresh air channel means and of the recirculating line means.

Claim 10

An installation according to claim 8, characterized in that said throttling means is arranged substantially at the discharge place of the recirculating line means in the fresh air channel means.

Claim 11

An installation according to claim 8, characterized in that a by-pass channel means by-passing the air filter insert means and terminating directly in the atmosphere, terminates in the fresh air channel means downstream of the air filter insert means, as viewed in the flow direction.

Claim 12

An installation according to claim 10, characterized in that a throttling means is provided in at least one of the two channel means consisting of the by-pass channel means and the fresh air channel means which at least partly closes the flow cross section and thereby enables a shifting of the main flow.

Claim 13

An installation according to claim 11, characterized in that a by-pass channel means by-passing the air filter insert means and terminating directly in the atmosphere, terminates in the fresh air channel means downstream of the air filter insert means, as viewed in the flow direction, a further throttling means is provided in at least one of the two channel means consisting of the by-pass channel means and the fresh air channel means which at least partly closes the flow cross-section and thereby enables a shifting of the main flow, and in that the last-mentioned throttling means is adapted to be selectively operated at will.

Claim 14

An installation according to claim 12, characterized in that the last-mentioned throttling means is operable to be actuated for closing and opening in accordance with signals determined by an air contamination sensor means.

Claim 15

An installation according to claim 11, with the air filter insert means arranged in the rear section of the passenger motor vehicle, characterized in that the fresh air channel means is conducted through a hollow longitudinal girder of the vehicle frame.

Claim 16

An installation according to claim 14, characterized in that the fresh air channel means is conducted through an intermediate space between an inner and outer wheel box of a rear wheel.

Claim 17

An installation according to claim 11, characterized in that an odor filter is arranged in the recirculating line means.

Claim 18

An installation according to claim 11, with a filter insert means for the fresh air arranged in a filter housing and including an odor filter, characterized in that the odor filter is arranged as last filter element in the filter housing as viewed in the flow direction and in that the recirculating line means terminates in the filter housing directly upstream of the odor filter.

Claim 19

An installation according to claim 11, characterized in that the means for decreasing the moisture in the recirculating line means are cooled surface means placed in the flow path of the recirculated air, arranged upstream of the heater radiator means and cooled below the condensation point of the recirculated air.

Claim 20

An installation according to claim 18, characterized in that the cooled surface means are formed by the evaporator of an air-condition installation.

Claim 21

An installation for ventilating the interior space of a passenger motor vehicle which includes air inlet and air discharge aperture means terminating in the atmosphere, at least one fresh air channel means leading from the air inlet aperture means into the interior space, fan means and at least one air filter insert means arranged in the fresh air channel means and adapted to be traversed by fresh air for filtering at least one of mechanical and chemical air contaminations, characterized in that at least one air channel means is extended along a space means accessible by way of a large continuous surface means, said one air channel means being enlarged within the area of this space means in a housing-like manner for receiving the air filter insert means and being provided with an opening means for the exchange of the air filter insert means, said opening means being of relatively large surface and adapted to be closed, a heat-exchanger for preheating the fresh air in the fresh air channel means is arranged upstream of the air filter insert means, as viewed in the flow direction, a recirculating line means has a first end terminating in the fresh air channel means, with a second end thereof communicating with the vehicle interior space, interchangeable means for a moisture removal are arranged in the recirculating line means and are traversed by the recirculating air, a variable throttle means at least partly closing the flow cross-section is provided at least in one of the two channel means consisting of the fresh air channel means and of the recirculating line means, a by-pass channel means by-passing the air filter insert means and terminating directly in the atmosphere, terminates in the fresh air channel means downstream of the air filter insert means as viewed in the flow direction, a further throttling means for partly closing the flow cross-section and enabling a shifting of the main flow is arranged within the area of a discharge of the by-pass channel means in the fresh air channel means.

Claim 22

An installation for ventilating the interior space of a passenger motor vehicle which includes air inlet and air discharge aperture means terminating in the atmosphere, at least one fresh air channel means leading from the air inlet aperture means into the interior space, fan means and at least one air filter insert means arranged in the fresh air channel means and adapted to be traversed by fresh air for filtering at least one of mechanical and chemical air contaminations, characterized in that at least one air channel means is extended along a space means accessible by way of a large continuous surface means, said one air channel means being enlarged within the area of this space means in a housing-like manner for receiving the air filter insert means and being provided with an opening means for the exchange of the air filter insert means, said opening means being of relatively large surface and adapted to be closed, a heat-exchanger for preheating the fresh air in the fresh air channel means is arranged upstream of the air filter insert means, as viewed in the flow direction, a recirculating line means has a first end terminating in the fresh air channel means, with a second end thereof communicating with the vehicle interior space, interchangeable means for a moisture removal are arranged in the recirculating line means and are traversed by the recirculating air, a variable throttle means at least partly closing the flow cross-section is provided at least in one of the two channel means consisting of the fresh air channel means and of the recirculating line means, a by-pass channel means by-passing the air filter insert means and terminating directly in the atmosphere, terminates in the fresh air channel means downstream of the air filter insert means as viewed in the flow direction, a further throttling means for partly closing the flow cross-section and enabling a shifting of the main flow is arranged within the area of a discharge of the by-pass channel means in the fresh air channel means.

Claim 23

An installation for ventilating the interior space of a passenger motor vehicle which includes air inlet and air discharge aperture means terminating in the atmosphere, at least one fresh air channel means leading from the air inlet aperture means into the interior space, fan means and at least one air filter insert means arranged in the fresh air channel means and adapted to be traversed by fresh air for filtering at least one of mechanical and chemical air contaminations, and with an air heater means arranged in the front section of the passenger motor vehicle and with air openings terminating in the vehicle passenger space in a front section of the passenger motor vehicle, characterized in that at least one air channel means is extended along a space means accessible by way of a large continuous surface means, said one air channel means being enlarged within the area of this space means in a housing-like manner for receiving the air filter insert means and being provided with an opening means for the exchange of the air filter insert means, said opening means being of relatively large surface and adapted to be closed, a heat-exchanger for preheating the fresh air in the fresh air channel means is arranged upstream of the air filter insert means, as viewed in the flow direction, a recirculating line means is provided with one end terminating in the fresh air channel means and another end communicating with the vehicle interior space, interchangeable means for a moisture removal are arranged in the recirculating line means and are traversed by the recirculating air, a variable throttle means at least partly closing the flow cross-section is provided at least in one of the two channel means consisting of the fresh air channel means and of the recirculating line means, a by-pass channel means by-passing the air filter insert means and terminating directly in the atmosphere, terminates in the fresh air channel means downstream of the air filter insert means, as viewed in the flow direction, a further throttling means is provided in at least one of the two channel means consisting of the by-pass channel means and the fresh air channel means which at least partly closes the flow cross-section and thereby enables a shifting of the main valve, and in that a fan means forcing the air through the passenger space is arranged within the area of the air heater means, and in that a further fan means supplying the fresh air through the air filter insert means and a connecting line means forming part of the fresh air channel means is arranged within the area of the air filter insert means.

Claim 24

An installation for ventilating the interior space of a passenger motor vehicle which includes air inlet and air discharge aperture means terminating in the atmosphere, at least one fresh air channel means leading from the air inlet aperture means into the interior space, fan means and at least one air filter insert means arranged in the fresh air channel means and adapted to be traversed by fresh air for filtering at least one of mechanical and chemical air contaminations, and with an air heater means arranged in the front section of the passenger motor vehicle and with air openings terminating in the vehicle passenger space in a front section of the passenger motor vehicle, characterized in that at least one air channel means is extended along a space means accessible by way of a large continuous surface means, said one air channel means being enlarged within the area of this space means in a housing-like manner for receiving the air filter insert means and being provided with an opening means for the exchange of the air filter insert means, said opening means being of relatively large surface and adapted to be closed, a heat-exchanger for preheating the fresh air in the fresh air channel means is arranged upstream of the air filter insert means, as viewed in the flow direction, a recirculating line means is provided with one end terminating in the fresh air channel means and another end communicating with the vehicle interior space, interchangeable means for a moisture removal are arranged in the recirculating line means and are traversed by the recirculating air, a variable throttle means at least partly closing the flow cross-section is provided at least in one of the two channel means consisting of the fresh air channel means and of the recirculating line means, a by-pass channel means by-passing the air filter insert means and terminating directly in the atmosphere, terminates in the fresh air channel means downstream of the air filter insert means, as viewed in the flow direction, a further throttling means is provided in at least one of the two channel means consisting of the by-pass channel means and the fresh air channel means which at least partly closes the flow cross-section and thereby enables a shifting of the main valve, and in that a fan means forcing the air through the passenger space is arranged within the area of the air heater means, and in that a further fan means supplying the fresh air through the air filter insert means and a connecting line means forming part of the fresh air channel means is arranged within the area of the air filter insert means.

Claim 25

An installation for ventilating the interior space of a passenger motor vehicle which includes air inlet and air discharge aperture means terminating in the atmosphere, at least one fresh air channel means leading from the air inlet aperture means into the interior space, fan means and at least one air filter insert means arranged in the fresh air channel means and adapted to be traversed by fresh air for filtering at least one of mechanical and chemical air contaminations, characterized in that at least one air channel means is extended along a space means accessible by way of a large continuous surface means, said one air channel means being enlarged within the area of this space means in a housing-like manner for receiving the air filter insert means and being provided with an opening means for the exchange of the air filter insert means, said opening means being of relatively large surface and adapted to be closed, and in that a recirculating line means terminates in the fresh air channel means downstream of the air filter insert means, as viewed in the flow direction.

Claim 26

An installation for ventilating the interior space of a passenger motor vehicle which includes air inlet and air discharge aperture means terminating in the atmosphere, at least one fresh air channel means leading from the air inlet aperture means into the interior space, fan means and at least one air filter insert means arranged in the fresh air channel means and adapted to be traversed by fresh air for filtering at least one of mechanical and chemical air contaminations, characterized in that at least one air channel means is extended along a space means accessible by way of a large continuous surface means, said one air channel means being enlarged within the area of this space means in a housing-like manner for receiving the air filter insert means and being provided with an opening means for the exchange of the air filter insert means, said opening means being of relatively large surface and adapted to be closed, and in that a recirculating line means terminates in the fresh air channel means downstream of the air filter insert means, as viewed in the flow direction.

Claim 27

An installation according to claim 22, characterized in that interchangeable means for a moisture removal are arranged in the recirculating line means, and are traversed by the recirculating air.

Claim 28

An installation according to claim 22, characterized in that a variable throttle means at least partly closing the flow cross section is provided at least in one of the two channel means consisting of the fresh air channel means and of the recirculating line means.

Claim 29

An installation according to claim 24, characterized in that said throttling means is arranged substantially at the discharge place of the recirculating line means in the fresh air channel means.

Claim 30

An installation according to claim 22, characterized in that a by-pass channel means by-passing the air filter insert means and terminating directly in the atmosphere, terminates in the fresh air channel means downstream of the air filter insert means, as viewed in the flow direction.

Claim 31

An installation according to claim 26, characterized in that a throttling means is provided in at least one of the two channel means consisting of the by-pass channel means and the fresh air channel means which at least partly closes the flow cross section and thereby enables a shifting of the main flow.

Claim 32

An installation according to claim 22, with the air filter insert means arranged in the rear section of the passenger motor vehicle, characterized in that the fresh air channel means is conducted through a hollow longitudinal girder of the vehicle frame.

Claim 33

An installation according to claim 22, characterized in that the fresh air channel means is conducted through an intermediate space between an inner and outer wheel box of a rear wheel.

Claim 34

An installation according to claim 22, characterized in that an odor filter is arranged in the recirculating line means.

Claim 35

An installation according to claim 22, with a filter insert means for the fresh air arranged in a filter housing and including an odor filter, characterized in that the odor filter is arranged as last filter element in the filter housing as viewed in the flow direction and in that the recirculating line means terminates in the filter housing directly upstream of the odor filter.

Claim 36

An installation according to claim 22, characterized in that means for decreasing the moisture in the recirculating line means are cooled surface means placed in the flow path of the recirculated air, arranged upstream of a heater radiator means and cooled below the condensation point of the recirculated air.

Claim 37

An installation according to claim 32, characterized in that the cooled surface means are formed by the evaporator of an air-condition installation.

Claim 38

An installation for ventilating the interior space of a passenger motor vehicle which includes air inlet and air discharge aperture means terminating in the atmosphere, at least one fresh air channel means leading from the air inlet aperture means into the interior space, fan means and at least one air filter insert means arranged in the fresh air channel means and adapted to be traversed by fresh air for filtering at least one of mechanical and chemical air contaminations, characterized in that at least one air channel means is extended along a space means accessible by way of a large continuous surface means, said one air channel means being enlarged within the area of this space means in a housing-like manner for receiving the air filter insert means and being provided with an opening means for the exchange of the air filter insert means, said opening means being of relatively large surface and adapted to be closed, a by-pass channel means by-passing the air filter insert means and terminating directly in the atmosphere, terminates in the fresh air channel means downstream of the air filter insert means, as viewed in the flow direction, a throttling means is provided in at least one of the two channel means consisting of the by-pass channel means and the fresh air channel means which at least partly closes the flow cross-section and thereby enables a shifting of the main flow, and in that said last-mentioned throttling means is arranged within the area of the discharge of the by-pass channel means in the fresh air channel means.

Claim 39

An installation for ventilating the interior space of a passenger motor vehicle which includes air inlet and air discharge aperture means terminating in the atmosphere, at least one fresh air channel means leading from the air inlet aperture means into the interior space, fan means and at least one air filter insert means arranged in the fresh air channel means and adapted to be traversed by fresh air for filtering at least one of mechanical and chemical air contaminations, characterized in that at least one air channel means is extended along a space means accessible by way of a large continuous surface means, said one air channel means being enlarged within the area of this space means in a housing-like manner for receiving the air filter insert means and being provided with an opening means for the exchange of the air filter insert means, said opening means being of relatively large surface and adapted to be closed, a by-pass channel means by-passing the air filter insert means and terminating directly in the atmosphere, terminates in the fresh air channel means downstream of the air filter insert means, as viewed in the flow direction, a throttling means is provided in at least one of the two channel means consisting of the by-pass channel means and the fresh air channel means which at least partly closes the flow cross-section and thereby enables a shifting of the main flow, and in that said last-mentioned throttling means is arranged within the area of the discharge of the by-pass channel means in the fresh air channel means.

Claim 40

An installation for ventilating the interior space of a passenger motor vehicle which includes air inlet and air discharge aperture means terminating in the atmosphere, at least one fresh air channel means leading from the air inlet aperture means into the interior space, fan means and at least one air filter insert means arranged in the fresh air channel means and adapted to be traversed by fresh air for filtering at least one of mechanical and chemical air contaminations, characterized in that at least one air channel means is extended along a space means accessible by way of a large continuous surface means, said one air channel means being enlarged within the area of this space in a housing-like manner for receiving the air filter insert means and being provided with an opening means for the exchange of the air filter insert means, said opening means being of relatively large surface and adapted to be closed, a by-pass channel means by-passing the air filter insert means and terminating directly in the atmosphere, terminates in the fresh air channel means downstream of the air filter insert means, as viewed in the flow direction, a throttling means is provided in at least one of the two channel means consisting of the by-pass channel means and the fresh air channel means which at least partly closes the flow cross-section and thereby enables a shifting of the main flow, and in that the last-mentioned throttling means is adapted to be selectively operated at will.

Claim 41

An installation for ventilating the interior space of a passenger motor vehicle which includes air inlet and air discharge aperture means terminating in the atmosphere, at least one fresh air channel means leading from the air inlet aperture means into the interior space, fan means and at least one air filter insert means arranged in the fresh air channel means and adapted to be traversed by fresh air for filtering at least one of mechanical and chemical air contaminations, characterized in that at least one air channel means is extended along a space means accessible by way of a large continuous surface means, said one air channel means being enlarged within the area of this space in a housing-like manner for receiving the air filter insert means and being provided with an opening means for the exchange of the air filter insert means, said opening means being of relatively large surface and adapted to be closed, a by-pass channel means by-passing the air filter insert means and terminating directly in the atmosphere, terminates in the fresh air channel means downstream of the air filter insert means, as viewed in the flow direction, a throttling means is provided in at least one of the two channel means consisting of the by-pass channel means and the fresh air channel means which at least partly closes the flow cross-section and thereby enables a shifting of the main flow, and in that the last-mentioned throttling means is adapted to be selectively operated at will.

Claim 42

An installation for ventilating the interior space of a passenger motor vehicle which includes air inlet and air discharge aperture means terminating in the atmosphere, at least one fresh air channel means leading from the air inlet aperture means into the interior space, fan means and at least one air filter insert means arranged in the fresh air channel means and adapted to be traversed by fresh air for filtering at least one of mechanical and chemical air contaminations, characterized in that at least one air channel means is extended along a space means accessible by way of a large continuous surface means, said one air channel means being enlarged within the area of this space means in a housing-like manner for receiving the air filter insert means and being provided with an opening means for the exchange of the air filter insert means, said opening means being of relatively large surface and adapted to be closed, a by-pass channel means by-passing the air filter insert means and terminating directly in the atmosphere, terminates in the fresh air channel means downstream of the air filter insert means, as viewed in the flow direction, a throttling means is provided in at least one of the two channel means consisting of the by-pass channel means and the fresh air channel means which at least partly closes the flow cross-section and thereby enables a shifting of the main flow, and in that the last-mentioned throttling means is operable to be actuated for closing and opening in accordance with signals determined by an air contamination sensor means.

Claim 43

An installation for ventilating the interior space of a passenger motor vehicle which includes air inlet and air discharge aperture means terminating in the atmosphere, at least one fresh air channel means leading from the air inlet aperture means into the interior space, fan means and at least one air filter insert means arranged in the fresh air channel means and adapted to be traversed by fresh air for filtering at least one of mechanical and chemical air contaminations, characterized in that at least one air channel means is extended along a space means accessible by way of a large continuous surface means, said one air channel means being enlarged within the area of this space means in a housing-like manner for receiving the air filter insert means and being provided with an opening means for the exchange of the air filter insert means, said opening means being of relatively large surface and adapted to be closed, a by-pass channel means by-passing the air filter insert means and terminating directly in the atmosphere, terminates in the fresh air channel means downstream of the air filter insert means, as viewed in the flow direction, a throttling means is provided in at least one of the two channel means consisting of the by-pass channel means and the fresh air channel means which at least partly closes the flow cross-section and thereby enables a shifting of the main flow, and in that the last-mentioned throttling means is operable to be actuated for closing and opening in accordance with signals determined by an air contamination sensor means.

Claim 44

An installation for ventilating the interior space of a passenger motor vehicle which includes air inlet and air discharge aperture means terminating in the atmosphere, at least one fresh air channel means leading from the air inlet aperture means into the interior space, fan means and at least one air filter insert means arranged in the fresh air channel means and adapted to be traversed by fresh air for filtering at least one of mechanical and chemical contaminations, and with an air heater means arranged in the front section of the passenger motor vehicle and with air openings terminating in the vehicle passenger space in the front section of the passenger motor vehicle, characterized in that at least one air channel means is extended along a space means accessible by way of a large continuous surface means, said one air channel means being enlarged within the area of this space means in a housing-like manner for receiving the air filter insert means and being provided with an opening means for the exchange of the air filter insert means, said opening means being of relatively large surface and adapted to be closed, and in that a fan means forcing the air through the passenger space is arranged within the area of the air heater means and in that a further fan means supplying the fresh air through the air filter insert means and a connecting line means forming part of the fresh air channel means is arranged within the area of the air filter insert means.

Claim 45

An installation for ventilating the interior space of a passenger motor vehicle which includes air inlet and air discharge aperture means terminating in the atmosphere, at least one fresh air channel means leading from the air inlet aperture means into the interior space, fan means and at least one air filter insert means arranged in the fresh air channel means and adapted to be traversed by fresh air for filtering at least one of mechanical and chemical contaminations, and with an air heater means arranged in the front section of the passenger motor vehicle and with air openings terminating in the vehicle passenger space in the front section of the passenger motor vehicle, characterized in that at least one air channel means is extended along a space means accessible by way of a large continuous surface means, said one air channel means being enlarged within the area of this space means in a housing-like manner for receiving the air filter insert means and being provided with an opening means for the exchange of the air filter insert means, said opening means being of relatively large surface and adapted to be closed, and in that a fan means forcing the air through the passenger space is arranged within the area of the air heater means and in that a further fan means supplying the fresh air through the air filter insert means and a connecting line means forming part of the fresh air channel means is arranged within the area of the air filter insert means.

Claim 46

An installation for ventilating the interior space of a passenger motor vehicle which includes air inlet and air discharge aperture means terminating in the atmosphere, at least one fresh air channel means leading from the air inlet aperture means into the interior space, at least one air filter insert means arranged in the fresh air channel means and adapted to be traversed by fresh air for filtering at least one of mechanical and chemical air to contaminations, characterized in that at least one air channel means is extended along a space means located below a hat storage surface disposed beneath a rear window of the vehicle, said one air channel means being enlarged within the area of this space means in a housing-like manner for receiving the air filter insert means and being provided with an opening means for the exchange of the air filter insert means, said opening means being of relatively large surface and adapted to be closed, a recirculating line means having one end terminating in said fresh air channel means and another end communicating with the vehicle interior space, moisture removal means are arranged in the recirculating line means and are traversed by the recirculating air so as to remove any moisture therefrom, and an odor filter means is arranged in said recirculating line means for removing odor from the air being recirculated in the motor vehicle.

Claim 47

An installation for ventilating the interior space of a passenger motor vehicle which includes air inlet and air discharge aperture means terminating in the atmosphere, at least one fresh air channel means leading from the air inlet aperture means into the interior space, at least one air filter insert means arranged in the fresh air channel means and adapted to be traversed by fresh air for filtering at least one of mechanical and chemical air to contaminations, characterized in that at least one air channel means is extended along a space means located below a hat storage surface disposed beneath a rear window of the vehicle, said one air channel means being enlarged within the area of this space means in a housing-like manner for receiving the air filter insert means and being provided with an opening means for the exchange of the air filter insert means, said opening means being of relatively large surface and adapted to be closed, a recirculating line means having one end terminating in said fresh air channel means and another end communicating with the vehicle interior space, moisture removal means are arranged in the recirculating line means and are traversed by the recirculating air so as to remove any moisture therefrom, and an odor filter means is arranged in said recirculating line means for removing odor from the air being recirculated in the motor vehicle.

Claim 48

An installation according to claim 35, characterized in that said air inlet aperture means are arranged at the rear of the motor vehicle.

Claim 49

An installation according to claim 39, characterized in that a by-pass channel means by-passing the air filter insert means and terminating directly in the atmosphere, terminates in the fresh air channel means downstream of the air filter insert means, as viewed in the flow direction.

Claim 50

An installation according to claim 39, characterized in that a throttling means is arranged within the area of a discharge of the by-pass channel means in the fresh air channel means for partly closing the flow cross-section and enabling a shifting of the main flow.

Claim 51

An installation according to claim 41, characterized in that the motor vehicle includes rear roof column means, and in that said air inlet aperture means are arranged at each rear roof column means.

Claim 52

An installation according to claim 38, characterized in that a by-pass channel means by-passing the air filter insert means and terminating directly in the atmosphere, terminates in the fresh air channel means downstream of the air filter insert means, as viewed in the flow direction.

Claim 53

An installation according to claim 43, characterized in that a throttling means is arranged within the area of a discharge of the by-pass channel means in the fresh air channel means for partly closing the flow cross-section and enabling a shifting of the main flow.