Move and refresh the stagnant air in your greenhouse or building to create a healthier and more productive growing environment. These greenhouse exhaust enthusiasts are excellent for reducing plant and employee heat stress. Our exhaust followers Greenhouse Exhaust Fan provide superb ventilation for high tunnels and cold frames. Create a cooler convenient growing environment, which can directly contribute to efficiency, quality and profitability for your greenhouse business. Exhaust enthusiasts also works great in workshops and buildings.
Move and refresh the stagnant atmosphere in your greenhouse to create a healthier and more productive environment. These exhaust & circulating fans are great for plant development. Create a cooler convenient 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 dates back to the beginning of managed environment. All greenhouses constructed prior to the 1950’s had some type of vents or louvers that were opened to allow the excess heat to flee and cooler outside air to enter.
When polyethylene originated with large sheets within the whole roof, placing vents on the roof proved difficult. Engineers then came up with the idea of using enthusiasts that pull outside atmosphere through louvers in a single endwall and exhaust it out the contrary end. With thermostatic control, this is, and still may be the accepted method for cooling many structures where positive atmosphere movement is needed.
Growers with hoophouses possess found that roll-up sides work very well for warm period ventilation. Both manual and motorized systems are available. A spot with good summer breezes and lots 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 lessen the amount of rain that can drip in.
Greenhouses with roof and sidewall vents are powered by the principle that warmth is removed by a pressure difference created by wind and temperature gradients. Wind performs the major function. In a smartly 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 flow out the vent. If sidewall vents are open, cool replacement atmosphere enters and drops to the ground level. If the sidewall vents are closed, great air enters underneath of the roof vent and the heated are escapes out the top of the vent.