This site has 'spinny' air vents for green houses, one is solar powered.
Bit pricy though.  Two Wests - Please enable your cookies
Cheaper one here... Please enable your cookies 
__________________
I wish i could make a yo-yo work.
http://www.guerrillagardening.org/
Last edited by seasprout; 12-04-2008 at 10:00 AM.
Reason: added new link
|