Move and refresh the stagnant air flow in your greenhouse or building to create a healthier and more productive developing environment. These greenhouse exhaust enthusiasts are excellent for reducing plant and worker heat tension. Our exhaust enthusiasts provide exceptional 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 functions great in workshops and buildings.
Move and refresh the stagnant air 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 idea of cooling a greenhouse with thermal buoyancy and wind dates back to the start of managed environment. All Greenhouse Vent Fan greenhouses constructed prior to the 1950’s acquired some form of vents or louvers that were opened to allow the excess heat to escape and cooler outside atmosphere to enter.

When polyethylene originated with large sheets within the whole roof, putting vents on the roof proved difficult. Engineers after that came up with the concept of using supporters that attract outside atmosphere through louvers in a single 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 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 lots of space between houses is needed. It helps to have greenhouses made with a vertical 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 temperature is removed by a pressure difference created by wind and temperature gradients. Wind plays the major role. 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 vacuum pressure and sucks the heated air flow out the vent. If sidewall vents are open up, cool replacement air enters and drops to the floor 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.