Move and refresh the stagnant surroundings in your greenhouse or building to make a healthier and more productive developing environment. These greenhouse exhaust fans are excellent for reducing plant and employee heat tension. Our exhaust fans provide exceptional ventilation for high tunnels and frosty frames. Create a cooler convenient growing environment, which can directly contribute to efficiency, quality and profitability for your greenhouse business. Exhaust fans also works 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 development. Create a cooler more comfortable 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 experienced some form of vents or louvers which were opened to enable the excess heat to flee and cooler outside air flow 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 concept of using enthusiasts that pull outside air Greenhouse Vent Fan through louvers in a single endwall and exhaust it out the contrary end. With thermostatic control, this was, and still is the accepted method for cooling many structures where positive air flow movement is needed.
Growers with hoophouses possess discovered that roll-up sides work well for warm period ventilation. Both manual and motorized systems can be found. A spot with good summer breezes and plenty of space between homes 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 may drip in.
Greenhouses with roof and sidewall vents are powered by the principle that warmth 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 more of the ventilation. Wind moving over the roof creates vacuum pressure and sucks the heated air 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, cool air enters the bottom of the roof vent and the heated are escapes out the very best of the vent.