Matches 1 - 32 out of 32
Match Document Document Title
7179165 Automatic vent damper  
The automatic vent damper has various embodiments of a wind actuated vent system, which automatically closes to preclude entry of wind blown water when a wind of predetermined velocity and...
6685557 Building ventilation air inlet assembly  
A building ventilation air inlet assembly for providing an adjustable venting assembly to permit automatic inlet of air includes a housing, an air opening extending through the housing, a valve...
6533656 Air handling system duct closure and heat trap  
A counterweight biased duct vent closure and door for a conventional overhead or surface mounted forced hot/cool air supply vent opening. The closure door includes a covering sized to fit over and...
6475078 Air ventilating device  
An air inlet device for use in automatically providing ventilation to the interior of buildings. The device has one of more openings each of which has a moveable louver pivoted at the lower side of...
5735739 Insulated external exhaust's end  
An outdoor exhaust's end of part of an indoor building system requiring an exhaust duct to evacuate air or other kinds of smoke or gases to the building's outside. The exhaust's end comprising a...
5567114 Fan closure flap  
This invention relates to a closure for the outlet of a fan. A fan has an outlet opening 12 in a fan case volute 10 which is closed by a hinged flap 13, the weight of the flap being compensated by...
5277658 Barometric damper apparatus  
Barometric damper apparatus is usable for both horizontal air flow and vertical air flow and thus comprises a universal barometric damper apparatus without a structural change. The barometric...
5092226 Incinerator chimney stack valve mechanism  
An incinerator chimney stack valve mechanism which normally prevents the flow of fluid from the chimney stack. The incinerator chimney stack valve mechanism is mounted upon the chimney stack...
4854225 Venting control device  
A device for controlling the venting of gases and unburned hydrocarbons from a source location into the atmosphere and includes an enhancement that prevents an entrance of cold drafts and foreign...
4667582 Dynamically balanced exhaust pipe cap  
A dynamically balanced protective cap for exhaust pipes, including a tubular element having an angulated bias cut defining a slanted opening at one end thereof. A closure flap assembly is pivotally...
4033247 Vent structure  
A vent structure for equalizing the pressure on opposite sides of a structure including a plenum formed at least in part by movable vent panel and a hinged panel supporting wall having overcenter...
3738254 BACKDRAFT DAMPER  
A backdraft damper comprises a frame defining an air control opening and a plurality of vanes mounted on the frame for closing the opening. The frame is assembled from frame sections of lightweight...
3204870 Ventilating apparatus for heating systems  
2965014 Vent closing louver apparatus  
2737879 Air pressure regulator  
2730943 Freeze-proof vent damper  
2614301 Louver construction  
2599075 Closure element for air ducts  
2314003 Counterbalanced louver construction  
2192009 Anti-back-draft damper  
2022143 Ventilator  
1934337 Ventilator  
1810831 Ventilating stovepipe  
1792585 Ventilator  
1619066 Automatic air and gas check valve  
3057288 Title is not available  
1196117 Title is not available  
1100297 Title is not available  
1100296 Title is not available  
0721683 Title is not available  
0526492 Title is not available  
0101972 Title is not available  
Matches 1 - 32 out of 32