Move and refresh the stagnant air in your greenhouse or building to make a healthier and more productive growing environment. These greenhouse exhaust supporters are great for 
reducing plant and worker heat stress. Our exhaust followers provide excellent ventilation for high tunnels and cool frames. Create a cooler convenient growing environment, which can directly contribute to productivity, quality and profitability for your greenhouse business. Exhaust followers also functions great in workshops and structures.
Move and refresh the stagnant surroundings in your greenhouse to create a healthier and more productive environment. These exhaust & circulating fans are great for plant growth. Create a cooler more comfortable growing environment, that may directly contribute to efficiency, quality and profitability for your greenhouse business.
The idea of cooling a greenhouse with thermal buoyancy and wind goes back to the Greenhouse Exhaust Fan beginning of controlled environment. All greenhouses built prior to the 1950’s acquired some kind of vents or louvers that were opened to allow the excess heat to flee and cooler outside surroundings to enter.
When polyethylene was developed with large sheets within the whole roof, placing vents on the roof proved difficult. Engineers then came up with the concept of using fans that draw outside atmosphere through louvers in one endwall and exhaust it out the opposite end. With thermostatic control, this was, and still may be the accepted way for cooling many structures where positive air movement is needed.
Growers with hoophouses possess found that roll-up sides work well for warm period ventilation. Both manual and motorized systems are available. A spot with good summer season breezes and lots of space between houses is needed. It can help to have greenhouses made with a vertical sidewall up to the elevation of the attachment rail to reduce the amount of rain that may drip in.
Greenhouses with roof and sidewall vents are powered by the principle that warmth is removed by a pressure difference created by wind and temperature gradients. Wind performs the major role. In a well designed greenhouse, a wind speed of 2-3 miles/hour provides 80% or even more of the ventilation. Wind passing over the roof creates a vacuum and sucks the heated atmosphere out the vent. If sidewall vents are open, cool replacement atmosphere enters and drops to the ground level. If the sidewall vents are closed, awesome air enters underneath of the roof vent and the heated are escapes out the top of the vent.