Move and refresh the stagnant atmosphere in your greenhouse or building to make a healthier and more productive developing environment. These greenhouse exhaust fans are great for reducing plant and employee heat stress. Our exhaust enthusiasts provide superb ventilation for high tunnels and chilly frames. Create a cooler convenient growing environment, which can directly contribute to productivity, quality and profitability for your 
greenhouse business. Exhaust fans also works great in workshops and structures.
Move and refresh the stagnant atmosphere in your greenhouse to make a healthier and more productive environment. These exhaust & circulating fans are great for plant development. Create a cooler convenient growing environment, that may 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 constructed prior to the 1950’s acquired some kind of vents or louvers that were opened to enable the excess heat to escape and cooler Greenhouse Exhaust Fan outside air flow to enter.
When polyethylene originated with large sheets covering the whole roof, putting vents on the top proved difficult. Engineers after that came up with the idea of using followers that attract outside atmosphere through louvers in a single endwall and exhaust it out the contrary end. With thermostatic control, this was, and still is the accepted way for cooling many structures where positive surroundings movement is needed.
Growers with hoophouses possess found that roll-up sides work very well for warm season ventilation. Both manual and motorized systems can be found. A spot with good summer season breezes and plenty of space between homes is needed. It can help to have greenhouses made with a vertical sidewall up to the height of the attachment rail to lessen the quantity of rain that may drip in.
Greenhouses with roof and sidewall vents operate on the principle that temperature is removed by a pressure difference created by wind and temperature gradients. Wind performs the major role. In a smartly designed greenhouse, a wind rate of 2-3 kilometers/hour provides 80% or more of the ventilation. Wind moving over the roof creates vacuum pressure 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, great air enters underneath of the roof vent and the heated are escapes out the top of the vent.