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If you use small vents they will only work in cool climates, small greenhouses,  and only if jammed to the top of the sides. - grid24_12
Here are more of the first vents we tried. They work ok for small greenhouses.
Then we started getting serious with our ventilation problems and we found Solar gigavents. - grid24_12
Then we started getting serious.
One of the greenhouse end walls with vents open. This solved most of our ventilation problems. That and keeping the greenhouse to 50 ft. instead of 100. Discovering you only have to carry plants 25 ft instead of 50 ft. also helped. - grid24_12
One of the greenhouse end walls with vents open. This solved most of our ventilation problems. That and keeping the greenhouse to 50 ft. instead of 100. Discovering you only have to carry plants 25 ft instead of 50 ft. also helped.
top vent of a polycarbonate greenhouse - grid24_12
Top vent of a polycarbonate greenhouse at an air temperature of about 90F.
The higher you can get the 'out' vent the better it will work, unless you have regular wind, then it needs to go high on the leeward end.
Outside of greenhouse looking at top vent. The higher you can get the 'out' vent the better it will work, unless you have regular wind, then it needs to go high on the leeward end. - grid24_12
Top vent of polycarbonate greenhouse from inside  the greenhouse. - grid24_12
The vent structure from inside the greenhouse.
Two different type of greenhouse end vents - grid24_12
Poly greenhouses are a little trickier, you have to frame the vents.
Large end vent on greenhouse. This end vent is 4 foot tall and 16 feet wide - grid24_12
The end of a small polyethylene greenhouse at about 90F.
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Edited on Dec 31, 2012. Authors:
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