Move and refresh the stagnant air in your greenhouse or building to create a healthier and more productive growing environment. These greenhouse exhaust followers are excellent for reducing plant and employee heat stress. Our exhaust fans provide excellent ventilation for high tunnels and Greenhouse Vent Fan 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 buildings.
Move and refresh the stagnant atmosphere 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 idea of cooling a greenhouse with thermal buoyancy and wind dates back to the start of controlled environment. All greenhouses constructed prior to the 1950’s acquired some kind of vents or louvers which were opened to enable 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 then came up with the concept of using enthusiasts that attract outside air flow through louvers in a single endwall and exhaust it out the 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 possess discovered that roll-up sides work very well for warm period ventilation. Both manual and motorized systems are available. A spot with good summertime breezes and lots of space between houses is needed. It helps to have greenhouses made with a vertical sidewall up to the elevation of the attachment rail to reduce the quantity of rain that can drip in.
Greenhouses with roof and sidewall vents operate on 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 rate of 2-3 miles/hour provides 80% or even more of the ventilation. Wind moving over the roof creates vacuum pressure and sucks the heated atmosphere out the vent. If sidewall vents are open, cool replacement air enters and drops to the floor level. If the sidewall vents are closed, awesome air enters underneath of the roof vent and the heated are escapes out the very best of the vent.