Move and refresh the stagnant air flow in your greenhouse or building to create a healthier and more Greenhouse Exhaust Fan productive developing environment. These greenhouse exhaust enthusiasts are great for reducing plant and worker heat stress. Our exhaust fans provide superb ventilation for high tunnels and cool frames. Create a cooler convenient growing environment, which can directly contribute to productivity, quality and profitability for your greenhouse business. Exhaust fans also works great in workshops and buildings.
Move and refresh the stagnant surroundings in your greenhouse to make a healthier and more productive environment. These exhaust & circulating fans are excellent for plant growth. 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 start of controlled environment. All greenhouses constructed just before the 1950’s experienced some form of vents or louvers which were opened to allow the excess heat to escape and cooler outside surroundings to enter.

When polyethylene originated with large sheets covering the whole roof, placing vents on the top proved difficult. Engineers after that came up with the idea of using supporters that draw outside atmosphere through louvers in a single endwall and exhaust it out the contrary end. With thermostatic control, this is, and still is the accepted method 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 summertime breezes and lots of space between houses is needed. It can help to have greenhouses made with a vertical sidewall up to the elevation of the attachment rail to reduce the quantity of rain that may drip in.

Greenhouses with roof and sidewall vents are powered by the principle that temperature is removed by a pressure difference created by wind and temperature gradients. Wind performs the major function. In a well designed greenhouse, a wind acceleration 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 flow 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, great air enters underneath of the roof vent and the heated are escapes out the very best of the vent.