Move and refresh the stagnant surroundings in your greenhouse or building to make a healthier and more productive growing environment. These greenhouse exhaust supporters are great for reducing plant and employee heat stress. Our exhaust fans provide exceptional ventilation for high tunnels and frosty frames. Create a cooler 
more comfortable growing environment, that may directly contribute to efficiency, quality and profitability for your greenhouse business. Exhaust fans also works great in workshops and structures.
Move and refresh the stagnant air in your greenhouse to make a healthier and more productive environment. These exhaust & circulating fans are excellent for plant growth. Create a cooler more comfortable growing environment, which can directly contribute to productivity, quality and profitability for your greenhouse business.
The concept of cooling a greenhouse with thermal buoyancy and wind dates back to the beginning of managed environment. All greenhouses built just before the 1950’s had some kind of vents or louvers that were opened to enable the excess heat to escape and cooler outside air to enter.
When polyethylene was developed with large sheets covering the whole roof, placing vents on the roof proved difficult. Engineers then came up with the idea of using fans that pull outside air Greenhouse Exhaust Fan through louvers in a single endwall and exhaust it out the opposite end. With thermostatic control, this was, and still is the accepted method for cooling many structures where positive atmosphere 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 homes is needed. It helps to have greenhouses made with a vertical sidewall up to the height of the attachment rail to reduce the quantity of rain that can drip in.
Greenhouses with roof and sidewall vents are powered by the principle that high temperature is removed by a pressure difference created by wind and temperature gradients. Wind plays the major part. In a smartly designed greenhouse, a wind quickness of 2-3 miles/hour provides 80% or more of the ventilation. Wind passing over the roof creates vacuum pressure and sucks the heated air flow out the vent. If sidewall vents are open up, cool replacement atmosphere enters and drops to the ground level. If the sidewall vents are closed, cool air enters underneath of the roof vent and the heated are escapes out the top of the vent.