Move and refresh the stagnant surroundings in your greenhouse or building to make a healthier and more productive developing environment. These greenhouse exhaust enthusiasts are excellent for reducing plant and employee heat stress. Our exhaust fans provide excellent ventilation for high tunnels and cold frames. Create a cooler convenient growing environment, that may directly contribute to efficiency, quality and profitability for your greenhouse business. Exhaust followers also works great in workshops and buildings.
Move and refresh the stagnant air flow in your greenhouse to create a healthier and more productive environment. These exhaust & circulating fans are great for plant growth. Create a cooler convenient 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 beginning of managed environment. All greenhouses constructed prior to the 1950’s acquired some form of vents or louvers which were opened to enable the excess heat to escape and cooler outside surroundings to enter.
When polyethylene was developed with large sheets within the whole roof, putting vents on the roof proved difficult. Engineers after 
that came up with the concept of using fans that draw outside air flow through louvers in a single endwall and exhaust it out the contrary end. With thermostatic control, this was, and still is the accepted method for cooling many structures where positive surroundings movement is needed.
Growers with hoophouses possess discovered that roll-up sides work well for warm time of year ventilation. Both manual and motorized systems can be found. A spot with good summer season breezes and plenty of space between houses is needed. It can help to have greenhouses designed with a vertical sidewall up to the elevation of the Greenhouse Vent Fan attachment rail to reduce 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 even more of the ventilation. Wind passing over the roof creates a vacuum and sucks the heated surroundings out the vent. If sidewall vents are open up, cool replacement air enters and drops to the ground level. If the sidewall vents are closed, great air enters the bottom of the roof vent and the heated are escapes out the top of the vent.