"Close to the Earth, near to the bone and low on the hog."

Hobbit House Home Page
The Sunny Johns        Photo Tours     Contact       Design Consulting      The Sunny John Papers    Solar Greenhouses     Search 
learn | read | listen  in | locate | talk | video

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.
click any picture to enter the album 
more Guidestone Distro Greenhouse
more SHCS Greenhouses
more Devices and Tools
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
Albums courtesy of HobbitHouse Productions © 2002

 

Going Concerns Unlimited specializes in designing
  Subterranean Heating and Cooling Systems 
for solar greenhouses. 

John Cruickshank at Going Concerns Unlimited

learn | read | listen  in | locate | talk | video

GCU keeps the Photo Tours coming by supporting
  the development of Hobbit House 
You can too !!

Supplying free and low cost consulting services for the sustainably inclined home and land owner since 1976:
  • Greenhouse Structures and Solar Heating

  • Natural Building

  • Permaculture Systems

  • Energy Conservation

Creative Commons License
GCU Works by MrHobbit are licensed under a Creative Commons Attribution-Share Alike 3.0 License.
Based on the work delivered free of charge at www.goingconcerns.com.
Permissions beyond the scope of this license may be available via inquiry.