Move and refresh the stagnant surroundings in your greenhouse or building to create a healthier and more productive growing environment. These greenhouse exhaust fans are great for reducing plant and employee heat tension. Our exhaust fans provide superb ventilation for high tunnels and cold frames. Create a cooler convenient growing environment, which can directly contribute to productivity, quality and profitability for your greenhouse business. Exhaust enthusiasts also works great in workshops and buildings.
Move and refresh the stagnant air flow in your greenhouse to make a healthier and more productive environment. These exhaust & circulating fans are excellent for plant development. Create a cooler convenient growing environment, that may directly contribute to productivity, quality and profitability for your greenhouse business.
The idea of Greenhouse Vent Fan cooling a greenhouse with thermal buoyancy and wind goes back to the beginning of managed environment. All greenhouses constructed just before the 1950’s had some type of vents or louvers that were opened to enable the excess heat to escape and cooler outside atmosphere to enter.
When polyethylene originated with large sheets within the whole roof, putting vents on the roof proved difficult. Engineers then came up with the concept of using followers that attract outside surroundings through louvers in a single endwall and exhaust it out the opposite end. With thermostatic control, this is, and still may be the accepted way for cooling many structures where positive air movement is needed.
Growers with hoophouses possess discovered that roll-up sides work well for warm time of year ventilation. Both manual and motorized systems are available. A spot with good summertime breezes and lots of space between homes is 
needed. It can help to have greenhouses made with a vertical sidewall up to the elevation of the attachment rail to reduce the quantity 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 function. In a well designed greenhouse, a wind swiftness of 2-3 miles/hour provides 80% or even more of the ventilation. Wind passing over the roof creates vacuum pressure and sucks the heated air out the vent. If sidewall vents are open, cool replacement air 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.