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 worker heat tension. Our exhaust supporters 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 supporters also functions great in workshops and structures.
Move and refresh the stagnant atmosphere in your greenhouse to make a healthier and more productive environment. These exhaust & circulating fans are great for plant development. 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 goes back to the start of controlled environment. All greenhouses built prior to the 1950’s got some kind of vents or louvers which were opened to allow the excess heat to escape and cooler outside atmosphere to enter.
When polyethylene was developed with large sheets covering the whole roof, placing vents on the top proved difficult. Engineers then came up with the idea of using fans that pull outside atmosphere through louvers in one 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 atmosphere movement is needed.
Growers with hoophouses have discovered that roll-up sides work well for warm season ventilation. Both manual and motorized systems are available. A location with good summer season breezes and lots of space between houses is needed. It helps to have greenhouses designed with a vertical sidewall up to the elevation of the attachment rail to reduce 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 performs the major part. In a well designed greenhouse, a wind speed of 2-3 miles/hour provides 80% or more of the ventilation. Wind moving over the roof creates a vacuum and sucks the heated air flow out the vent. If sidewall vents are open up, cool replacement surroundings 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 top of the vent.
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