Move and refresh the stagnant surroundings in your greenhouse or building to create a healthier and more productive developing environment. These greenhouse exhaust fans are excellent for reducing plant and worker heat tension. Our exhaust followers provide excellent ventilation for high tunnels and chilly frames. Create a cooler more comfortable growing environment, which can directly contribute to efficiency, quality and profitability for your greenhouse business. Exhaust supporters also works great in workshops and buildings.
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 productivity, quality and profitability for your greenhouse business.
The concept of cooling a greenhouse with thermal buoyancy and wind dates back to the start of managed environment. All greenhouses built prior to the 1950’s had some form of vents or louvers that were Greenhouse Exhaust Fan opened to enable the excess heat to escape and cooler outside air to enter.
When polyethylene was developed with large sheets covering the whole roof, putting vents on the roof 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 is 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 period ventilation. Both manual and motorized systems are available. A location with good summer breezes and plenty of space between homes is needed. It can help to have greenhouses made with a vertical sidewall up to the height of the attachment rail to lessen 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 function. In a well designed greenhouse, a wind swiftness of 2-3 miles/hour provides 80% or more of the ventilation. Wind passing over the roof creates a vacuum and sucks the heated air out the vent. If sidewall vents are open, cool replacement air flow enters and drops to the ground level. If the sidewall vents are closed, awesome air enters underneath of the roof vent and the heated are escapes out the very best of the vent.