Move and refresh the stagnant atmosphere in your greenhouse or building to make a healthier and more productive growing environment. These greenhouse exhaust fans are excellent for reducing plant and worker heat stress. Our exhaust followers provide excellent ventilation for high tunnels and frosty frames. Create a cooler more comfortable growing environment, which can directly contribute to productivity, quality and profitability for your greenhouse business. Exhaust fans 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, which can directly contribute to productivity, quality and profitability for your greenhouse business.
The idea of cooling a greenhouse with thermal buoyancy and wind goes back to the start of managed environment. All greenhouses built just before the 1950’s acquired some type of vents or louvers which were opened to allow the excess heat to escape and cooler outside air to enter.

When polyethylene originated with large sheets Greenhouse Vent Fan covering the whole roof, putting vents on the top proved difficult. Engineers after that came up with the concept of using followers that draw outside air flow 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 found that roll-up sides work well for warm time of year ventilation. Both manual and motorized systems are available. A location with good summer season 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 quantity of rain that may 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 plays the major role. In a smartly designed greenhouse, a wind acceleration of 2-3 kilometers/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 atmosphere enters and drops to the floor level. If the sidewall vents are closed, awesome air enters the bottom of the roof vent and the heated are escapes out the very best of the vent.