Air modulating fume system

Claim 1

A fume-control system comprising: a. a building having a roof and roof trusses directly below and supporting said roof, b. a source of hot fumes in said building, c. a downwardly facing canopy-type hood situated in the roof truss area and spaced above said source of fumes, d. means for exhausting fumes from said hood and for conducting said fumes to the exterior of said building, e. means forming a plurality of downwardly facing air plenum chambers open at the bottom thereof to permit cold air at a temperature less than the ambient temperature within said building to flow downwardly therefrom, said air plenum chambers being disposed along and contiguous to opposite sides of said hood, said means (e) utilizing portions of said roof to form upper surfaces of said chambers and including panels secured to said roof trusses to form side walls of said chambers, f. means for introducing cold air into said plenum chambers comprising blowers for each plenum chamber arranged to take atmospheric air directly from exteriorly of said building at a height above ground level and blow said air into said plenum chambers, g. means forming openings in said building whereby winds exteriorly of said building may blow crosswise of said source of hot fumes, h. means responsive to changes in velocity of said winds for increasing the speed of at least one of said blowers.

Claim 3

A method of controlling fumes in a building having a source of upwardly rising fumes therein and wherein the upwardly rising fumes are at times subjected to cross winds of varying magnitudes of velocity blowing through said building, said method comprising: a. forming a low-pressure suction zone above said source of fumes, b. introducing cold air exteriorly of said building, said air being colder than the ambient air temperature within said building, discharging said cold air downwardly alongside of and directly by opposite sides of said low-pressure suction zone, and then flowing said discharged cold air downwardly in said building towards said source of fumes, c. confining said upwardly rising fumes by and between the downward flows of cold air and directing said fumes by said cold air to said low-pressure suction zone, d. collecting said fumes in said low-pressure suction zone and exhausting said collected fumes to the exterior of said building, e. increasing the volume of downward flow of air on the downwind side of the fumes as the velocity of the cross wind increases and decreasing said volume of downward flow as the cross wind velocity decreases.

Claim 4

A method of controlling fumes in a building having a source of upwardly rising fumes therein and wherein the upwardly rising fumes are at times subjected to cross winds of varying magnitudes of velocity blowing through said building, said method comprising: a. forming a low-pressure suction zone above said source of fumes, b. introducing cold air exteriorly of said building, said air being colder than the ambient air temperature within said building, discharging said cold air downwardly alongside of and directly by opposite sides of said low-pressure suction zone, and then flowing said discharged cold air downwardly in said building towards said source of fumes, c. confining said upwardly rising fumes by and between the downward flows of cold air and directing said fumes by said cold air to said low-pressure suction zone, d. collecting said fumes in said low-pressure suction zone and exhausting said collected fumes to the exterior of said building, e. increasing the volume of downward flow of air on the downwind side of the fumes as the velocity of the cross wind increases and decreasing said volume of downward flow as the cross wind velocity decreases.