Move and refresh the stagnant surroundings in your greenhouse or building to create a healthier and more productive growing environment. These greenhouse exhaust enthusiasts are excellent for reducing plant and worker heat tension. Our exhaust fans provide excellent ventilation for high tunnels and cool 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 air flow in your greenhouse to make a healthier and more productive environment. These exhaust & circulating fans are great for plant development. Create a cooler more comfortable growing environment, that may directly contribute to productivity, quality and profitability for your greenhouse business.
The idea of cooling a greenhouse with thermal buoyancy and wind dates back to the start of managed environment. All greenhouses constructed prior to the 1950’s experienced some type of vents or louvers which were opened to enable the excess heat to flee and cooler outside air flow to enter.

When polyethylene was developed with large sheets within the whole roof, putting vents on the roof proved difficult. Engineers after that came up with the idea of using followers that pull outside air through louvers in one endwall and exhaust it out the Greenhouse Vent Fan opposite end. With thermostatic control, this was, and still may be the accepted way for cooling many structures where positive surroundings movement is needed.

Growers with hoophouses have found that roll-up sides work very well for warm time of year ventilation. Both manual and motorized systems can be found. A location with good summertime breezes and plenty of space between houses is needed. It helps to have greenhouses made with a vertical sidewall up to the height of the attachment rail to lessen the quantity of rain that can drip in.

Greenhouses with roof and sidewall vents are powered by the principle that high temperature is removed by a pressure difference created by wind and temperature gradients. Wind plays the major function. 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 up, cool replacement surroundings enters and drops to the floor level. If the sidewall vents are closed, great air enters the bottom of the roof vent and the heated are escapes out the top of the vent.