Move and refresh the stagnant air flow in your greenhouse or building to create a healthier and more productive growing environment. These greenhouse exhaust fans are excellent for reducing plant and employee heat tension. Our exhaust enthusiasts provide exceptional ventilation for high tunnels and chilly frames. Create a cooler convenient growing environment, which can directly contribute to efficiency, quality and profitability for your greenhouse business. Exhaust followers also works great in workshops and buildings.
Move and refresh the stagnant air flow in your greenhouse to create 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 efficiency, quality and profitability for 
your greenhouse business.
The concept of cooling a greenhouse with thermal buoyancy and wind goes back to the beginning of managed environment. All greenhouses constructed just before the 1950’s experienced some form of vents or louvers which were opened to enable the excess heat to flee and cooler outside atmosphere to enter.
When polyethylene originated with large sheets covering the whole roof, placing vents on the roof proved difficult. Engineers then came up with the concept of using followers that pull outside surroundings through louvers in a single endwall and exhaust it out the contrary end. With thermostatic control, this is, and still may be the accepted Greenhouse Vent Fan method for cooling many structures where positive air movement is needed.
Growers with hoophouses have discovered that roll-up sides work well for warm season ventilation. Both manual and motorized systems can be found. A spot with good summer time breezes and lots of space between homes is needed. It helps to have greenhouses made with a vertical sidewall up to the elevation of the attachment rail to lessen the quantity of rain that can drip in.
Greenhouses with roof and sidewall vents operate on the principle that warmth is removed by a pressure difference created by wind and temperature gradients. Wind performs the major role. In a smartly designed greenhouse, a wind velocity of 2-3 kilometers/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 flow enters and drops to the floor level. If the sidewall vents are closed, awesome air enters the bottom of the roof vent and the heated are escapes out the top of the vent.