Move and refresh the stagnant atmosphere in your greenhouse or building to create a healthier and more productive developing environment. These greenhouse exhaust supporters are great for reducing plant and employee heat tension. Our exhaust supporters provide excellent ventilation for high tunnels and cold frames. Create a cooler more comfortable growing environment, which can directly contribute to productivity, quality and profitability for your greenhouse business. Exhaust followers also works great in workshops and structures.
Move and refresh the stagnant surroundings in your greenhouse to make a healthier and more productive environment. These exhaust & circulating fans are great for plant growth. Create a cooler convenient growing environment, which can directly contribute to efficiency, quality and profitability for your greenhouse business.
The concept of cooling a greenhouse with thermal buoyancy and wind dates back to the Greenhouse Vent Fan beginning of controlled environment. All greenhouses constructed just before the 1950’s got 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 within the whole roof, placing vents on the roof proved difficult. Engineers then came up with the idea of using supporters that pull outside atmosphere through louvers in one endwall and exhaust it out the opposite end. With thermostatic control, this was, and still is the accepted way for cooling many structures where positive atmosphere movement is needed.
Growers with hoophouses have found that roll-up sides work well for warm time of year ventilation. Both manual and motorized systems are available. A location with good summertime breezes and lots of space between houses is needed. It can help to have greenhouses made with a vertical sidewall up to the height of the attachment rail to lessen the amount of rain that may 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 performs the major function. In a well 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 air out the vent. If sidewall vents are open, cool replacement atmosphere enters and drops to the ground 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.