Move and refresh the stagnant surroundings in your greenhouse or building to make a Greenhouse Exhaust Fan healthier and more productive developing environment. These greenhouse exhaust fans are excellent for reducing plant and employee heat stress. Our exhaust followers provide exceptional ventilation for high tunnels and frosty frames. Create a cooler more comfortable growing environment, that may directly contribute to productivity, quality and profitability for your greenhouse business. Exhaust supporters also works great in workshops and structures.
Move and refresh the stagnant air flow in your greenhouse to create a healthier and more productive environment. These exhaust & circulating fans are great for plant development. Create a cooler more comfortable 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 beginning of controlled environment. All greenhouses constructed just before the 1950’s experienced some type of vents or louvers which were opened to allow the excess heat to flee and cooler outside air flow to enter.

When polyethylene was developed with large sheets covering the whole roof, putting vents on the roof proved difficult. Engineers then came up with the idea of using fans that draw outside surroundings through louvers in one endwall and exhaust it out the contrary end. With thermostatic control, this is, and still may be the accepted way for cooling many structures where positive air flow movement is needed.

Growers with hoophouses have discovered that roll-up sides work very well for warm time of year ventilation. Both manual and motorized systems are available. A location with good summer 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 may 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 function. In a smartly designed greenhouse, a wind rate of 2-3 miles/hour provides 80% or more of the ventilation. Wind passing over the roof creates a vacuum and sucks the heated air out the vent. If sidewall vents are open up, 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.