Move and refresh the stagnant air flow in your greenhouse or building to create a healthier and more productive developing environment. These greenhouse exhaust fans are great for reducing plant and employee heat stress. Our exhaust supporters provide superb 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 enthusiasts also functions 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 growth. Create a cooler more comfortable growing environment, which can directly contribute to efficiency, quality and profitability for your greenhouse business.
The idea 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 had some type of vents or louvers that were opened to allow the excess heat to escape and cooler outside atmosphere to enter.

When polyethylene was developed with large sheets covering the whole roof, placing vents on the top proved difficult. Engineers then came up with the concept of using followers that pull outside air through louvers in one endwall and exhaust it out the opposite end. With thermostatic control, this is, and still is the accepted way for cooling many structures where positive surroundings 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 location with good summer breezes and lots of space between homes is needed. It helps to have greenhouses designed with a vertical sidewall up to the height of the attachment rail to lessen the quantity of rain that may drip in.

Greenhouses with roof and sidewall vents operate on the principle that high Greenhouse Exhaust Fan temperature is removed by a pressure difference created by wind and temperature gradients. Wind plays the major part. In a well designed greenhouse, a wind speed of 2-3 kilometers/hour provides 80% or even more of the ventilation. Wind passing over the roof creates a vacuum and sucks the heated atmosphere out the vent. If sidewall vents are open up, cool replacement atmosphere 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 top of the vent.