Move and refresh the stagnant air flow in your greenhouse or building to create a healthier and more productive growing environment. These greenhouse exhaust followers are great for reducing plant and employee heat tension. Our exhaust fans provide superb ventilation for high tunnels and chilly frames. Create a cooler convenient growing environment, which can 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 flow in your greenhouse to make a healthier and more productive environment. These exhaust & circulating fans are excellent 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 start of controlled environment. All greenhouses built just before the 1950’s had some form of vents or louvers that were opened to allow the excess heat to escape and cooler outside air to enter.
When polyethylene was developed with large sheets covering the whole roof, placing vents on the roof proved difficult. Engineers after that came up with the idea of using followers that attract outside atmosphere through louvers in a single 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 movement is needed.
Growers with hoophouses have discovered that roll-up sides work very well for warm period ventilation. Both manual and motorized systems are available. A spot with good summer season breezes and 
plenty of space between houses is needed. It helps to have greenhouses made with a vertical Greenhouse Exhaust Fan sidewall up to the height of the attachment rail to lessen the quantity of rain that can drip in.
Greenhouses with roof and sidewall vents operate on the principle that heat is removed by a pressure difference created by wind and temperature gradients. Wind plays the major role. In a well designed greenhouse, a wind rate of 2-3 kilometers/hour provides 80% or 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 up, cool replacement air flow enters and drops to the floor level. If the sidewall vents are closed, great air enters underneath of the roof vent and the heated are escapes out the very best of the vent.