Move and refresh the stagnant air in your greenhouse or building to make a healthier and more productive developing environment. These greenhouse exhaust followers are excellent for reducing plant and worker heat tension. Our exhaust supporters provide exceptional ventilation for high tunnels and frosty frames. Create a cooler convenient growing environment, that may directly contribute to efficiency, quality and profitability for your greenhouse business. Exhaust supporters also works great in workshops and structures.
Move and refresh the stagnant atmosphere in your greenhouse to create a healthier and more productive environment. These exhaust & Greenhouse Vent Fan circulating fans are excellent for plant development. Create a cooler convenient growing environment, which can directly contribute to efficiency, quality and profitability for your greenhouse business.
The concept of cooling a greenhouse with thermal buoyancy and wind goes back to the start of managed environment. All greenhouses built just before the 1950’s acquired some form of vents or louvers that were opened to enable the excess heat to flee 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 fans that draw outside surroundings 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 have found that roll-up sides work well for warm time of year ventilation. Both manual and motorized systems can be found. A spot with good summer time breezes and plenty 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 lessen the amount of rain that can drip in.
Greenhouses with roof and sidewall vents operate on the principle that high temperature is removed by a pressure difference created by wind and temperature gradients. Wind performs the major function. In a smartly designed greenhouse, a wind swiftness of 2-3 kilometers/hour provides 80% or 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 flow 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 very best of the vent.