greenhouse exhaust fan

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 employee heat stress. Our exhaust followers provide exceptional ventilation for high tunnels and frosty frames. Create a cooler convenient growing environment, which can directly contribute to productivity, quality and profitability for your greenhouse business. Exhaust followers also works great in workshops and buildings.
Move and refresh the stagnant air in your greenhouse to create a healthier and more productive environment. These exhaust & Greenhouse Exhaust Fan circulating fans are great for plant development. Create a cooler more comfortable growing environment, which can directly contribute to productivity, quality and profitability for your greenhouse business.
The concept of cooling a greenhouse with thermal buoyancy and wind goes back to the beginning of managed environment. All greenhouses built just before the 1950’s got some type of vents or louvers that were opened to enable the excess heat to escape and cooler outside air to enter.

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

Growers with hoophouses have found that roll-up sides work very well for warm period ventilation. Both manual and motorized systems can be found. A location with good summer breezes and plenty of space between homes is needed. It helps to have greenhouses designed with a vertical sidewall up to the height 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 high temperature is removed by a pressure difference created by wind and temperature gradients. Wind plays the major part. In a well designed greenhouse, a wind swiftness of 2-3 kilometers/hour provides 80% or more of the ventilation. Wind passing over the roof creates a vacuum and sucks the heated atmosphere out the vent. If sidewall vents are open up, cool replacement atmosphere 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 top of the vent.

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