Ventilator

Claim 2

A ventilator adapted to be mounted on the ceiling of a room space to be ventilated and to ventilate the room space to the outside via an opening extending through the ceiling from the inside of the ceiling to the outside of the ceiling, said ventilator comprising a body, said body comprising a conduit having a generally vertical axis and defining a generally vertical passage, said conduit being open at the upper end thereof and adapted to communicate the room space to the outside via the ceiling opening, blower means for drawing air from the room space and blowing the same through said conduit to the outside, mounting means for mounting the ventilator on the ceiling, a damper located above said blower means and disposed over the open upper ends of said conduit, and guide means for guiding said damper for generally vertical bodily movement relative to said conduit, said damper being Biased into a closed position closing the open upper end of said conduit when said blower means is idle and being displaced bodily upwardly from its closed position when said blower means is actuated, said guide means comprising a post generally coaxial with said conduit, said damper comprising means defining an opening therein, said post passing through said damper opening, said damper opening and the cross section of said post being of similar noncircular shape thereby to provide said damper with vertical sliding engagement with said post and substantially constraining said damper against rotary displacement about said post, and a cover covering the upper end of said body, said post being disposed on said cover, and retaining means for retaining said damper on said post, and an annular flashing plate generally around said conduit and extending in an outward direction therefrom generally parallel to the roof line.

Claim 3

In combination with the ceiling of a room space to be ventilated wherein the exterior of the ceiling is exposed to outside weather conditions, a ventilator unit for ventilating the room space to outside via an opening extending through the ceiling, said ventilator unit comprising: a conduit extending vertically through said ceiling opening and having an open upper end disposed at a level above the ceiling; blower means disposed within said conduit; a damper disposed over the open upper end of said conduit; vertically extending guide means centrally located with respect to said damper for guiding said damper for vertical displacement relative to said conduit so as to permit said damper to close the open upper end of said conduit when said blower means is idle and to permit said damper to be displaced bodily upwardly from the open upper end of said conduit when said blower means is actuated; a cover enclosing said damper and the open upper end of said conduit means, said cover comprising a top portion disposed vertically above said damper and a side portion extending downwardly from said top portion around said damper and said conduit to the ceiling; means defining an opening in said cover side portion which is substantially disposed vertically below the open upper end of said conduit and through which room exhaust passes when said blower means is actuated; an annular flashing plate extending between said conduit and said cover side portion at a level vertically above the ceiling, said flashing plate including a lip portion thereof extending through said cover side portion opening; said damper sloping downwardly in the radially outward direction from said guide means and overhanging the open upper end of said conduit whereby moisture which collects on the upper surface of said damper tends to run off the damper, to drop onto said flashing plate, and to run off through said cover side portion opening.

Claim 4

In combination with the ceiling of a room space to be ventilated wherein the exterior of the ceiling is exposed to outside weather conditions, a ventilator unit for ventilating the room space to outside via an opening extending through the ceiling, said ventilator unit comprising: a conduit extending vertically through said ceiling opening and having an open upper end disposed at a level above the ceiling; blower means disposed within said conduit; a damper disposed over the open upper end of said conduit; vertically extending guide means centrally located with respect to said damper for guiding said damper for vertical displacement relative to said conduit so as to permit said damper to close the open upper end of said conduit when said blower means is idle and to permit said damper to be displaced bodily upwardly from the open upper end of said conduit when said blower means is actuated; a cover enclosing said damper and the open upper end of said conduit means, said cover comprising a top portion disposed vertically above said damper and a side portion extending downwardly from said top portion around said damper and said conduit to the ceiling; means defining an opening in said cover side portion which is substantially disposed vertically below the open upper end of said conduit and through which room exhaust passes when said blower means is actuated; an annular flashing plate extending between said conduit and said cover side portion at a level vertically above the ceiling, said flashing plate including a lip portion thereof extending through said cover side portion opening; said damper sloping downwardly in the radially outward direction from said guide means and overhanging the open upper end of said conduit whereby moisture which collects on the upper surface of said damper tends to run off the damper, to drop onto said flashing plate, and to run off through said cover side portion opening.

Claim 5

The combination as claimed in claim 2 wherein said damper comprises a radially inner portion having a given downward slope and a radially outer portion having a downward slope greater than the downward slope of said radially inner portion, said radially outer portion resting on the open upper end of said conduit when said blower means is idle.