Move and refresh the stagnant surroundings in your greenhouse or building to make a healthier and more productive developing environment. These greenhouse exhaust followers are excellent for reducing plant and worker heat tension. Our exhaust supporters provide superb ventilation for high tunnels and frosty frames. Create a cooler convenient growing environment, that may directly contribute to productivity, quality and profitability for your greenhouse business. Exhaust supporters also functions great in workshops and structures.
Move and refresh the stagnant air in your greenhouse to create a healthier and more productive environment. These exhaust & circulating fans are excellent 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 beginning of controlled environment. All greenhouses built just before the Greenhouse Vent Fan 1950’s acquired some kind of vents or louvers that were opened to enable the excess heat to flee and cooler outside air flow to enter.
When polyethylene was developed with large sheets covering the whole roof, putting vents on the top proved difficult. Engineers after that came up with the idea of using enthusiasts that attract outside air flow through louvers in a single 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 discovered 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 helps to have greenhouses designed with a vertical sidewall up to the elevation of the attachment rail to reduce the amount of rain that can drip in.
Greenhouses with roof and sidewall vents are powered by the principle that heat is removed by a pressure difference created by wind and temperature gradients. Wind plays the major function. In a well designed greenhouse, a 
wind quickness 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 surroundings enters and drops to the ground level. If the sidewall vents are closed, cool air enters underneath of the roof vent and the heated are escapes out the top of the vent.