Move and refresh the stagnant atmosphere in your Greenhouse Vent Fan greenhouse or building to create a healthier and more productive developing environment. These greenhouse exhaust supporters are great for reducing plant and worker heat stress. Our exhaust supporters provide excellent ventilation for high tunnels and cold frames. Create a cooler convenient growing environment, which can 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 surroundings 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 dates back to the beginning of controlled environment. All greenhouses constructed just before the 1950’s got some form of vents or louvers that were opened to allow the excess heat to escape and cooler outside air flow to enter.
When polyethylene originated with large sheets within the whole roof, placing vents on the top proved difficult. Engineers after that came up with the idea of using enthusiasts that pull outside atmosphere through louvers in one endwall and exhaust it out the contrary end. With thermostatic control, this was, and still is the accepted way for cooling many structures where positive atmosphere movement is needed.
Growers with hoophouses have found that roll-up sides work very well for warm period ventilation. Both manual and motorized systems are available. A location with good summer breezes and lots of space between houses is needed. It can help to have greenhouses made with a vertical sidewall up to the height of the attachment rail to lessen the amount 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 performs the major part. In a smartly designed greenhouse, a wind quickness 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 flow out the vent. If sidewall vents are open, cool replacement surroundings enters and drops to the ground level. If the sidewall vents are closed, cool air enters the bottom of the roof vent and the heated are escapes out the top of the vent.