Move and refresh the stagnant air in your Greenhouse Exhaust Fan greenhouse or building to create a healthier and more productive growing environment. These greenhouse exhaust enthusiasts are excellent for reducing plant and worker heat tension. Our exhaust fans provide exceptional ventilation for high tunnels and frosty frames. Create a cooler more comfortable growing environment, that may directly contribute to efficiency, quality and profitability for your greenhouse business. Exhaust enthusiasts also functions great in workshops and buildings.
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 growth. Create a cooler more comfortable growing environment, which can directly contribute to efficiency, quality and profitability for your greenhouse business.
The idea of cooling a greenhouse with thermal buoyancy and wind goes back to the start of controlled environment. All greenhouses built just before the 1950’s experienced some type of vents or louvers which were opened to allow the excess heat to flee and cooler outside surroundings to enter.

When polyethylene was developed with large sheets within the whole roof, placing vents on the roof proved difficult. Engineers then came up with the concept of using enthusiasts that draw outside air through louvers in one endwall and exhaust it out the opposite end. With thermostatic control, this is, and still may be the accepted method for cooling many structures where positive air flow movement is needed.

Growers with hoophouses have discovered that roll-up sides work 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 passing 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 floor 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.