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Passive Backdraft Damper

Use this damper to allow cold air to "fall" out of a space or hot air to "rise" out of a space - all with no energy expense and just the cost of a window screen. When working with solar passive systems for hot air heating or cooling, there is often a need to control the flow of air. The usual approach is to use dampers and electrically powered and thermostatically operated fans. If you want totally passive action though, normal dampers are too heavy to operate on passive flows. This design is sensitive enough to allow the slightest breeze to open the louvers and allow passage in only one direction.
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Passive Backdraft Damper
12/10/99
Passive Backdraft Damper
12/10/99
Passive Backdraft Damper
12/10/99
Passive Backdraft Damper
12/10/99
Passive Backdraft Damper
12/10/99
Passive Backdraft Damper
12/10/99
Passive Backdraft Damper
12/10/99
Passive Backdraft Damper
12/10/99
Passive Backdraft Damper
12/10/99
Passive Backdraft Damper
12/10/99
Passive Backdraft Damper
12/10/99
Passive Backdraft Damper
12/10/99
Passive Backdraft Damper
12/10/99
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Going Concerns Unlimited specializes in designing
  Subterranean Heating and Cooling Systems 
for solar greenhouses. 

John Cruickshank at Going Concerns Unlimited

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