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November 18, 2019

Move and refresh the stagnant air in your greenhouse or building to create a healthier and more productive developing environment. These greenhouse Greenhouse Vent Fan exhaust enthusiasts are excellent for reducing plant and worker heat stress. Our exhaust enthusiasts provide exceptional ventilation for high tunnels and chilly frames. Create a cooler more comfortable growing environment, that may directly contribute to efficiency, quality and profitability for your greenhouse business. Exhaust supporters 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 more comfortable 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 goes back to the beginning of controlled environment. All greenhouses built prior to the 1950’s got some form of vents or louvers which were opened to enable the excess heat to escape and cooler outside air to enter.

When polyethylene originated with large sheets within the whole roof, placing vents on the roof proved difficult. Engineers after that came up with the idea of using enthusiasts that attract outside surroundings through louvers in one endwall and exhaust it out the opposite end. With thermostatic control, this is, and still may be the accepted way for cooling many structures where positive atmosphere movement is needed.

Growers with hoophouses possess found that roll-up sides work well for warm season ventilation. Both manual and motorized systems can be found. A location with good summertime breezes and lots of space between homes is needed. It can help to have greenhouses made with a vertical sidewall up to the height of the attachment rail to reduce the amount of rain that may drip in.

Greenhouses with roof and sidewall vents operate on the principle that high 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 out the vent. If sidewall vents are open, cool replacement air enters and drops to the floor level. If the sidewall vents are closed, cool air enters underneath of the roof vent and the heated are escapes out the very best of the vent.