November 18, 2019

Move and refresh the stagnant atmosphere in your greenhouse or building to make a healthier and more productive growing environment. These greenhouse exhaust enthusiasts are excellent for reducing plant and worker heat stress. Our exhaust fans provide exceptional ventilation for high tunnels and chilly frames. Create a cooler convenient growing environment, that may directly contribute to productivity, quality and profitability for your greenhouse business. Exhaust supporters also works great in workshops and buildings.
Move and refresh the stagnant surroundings 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, which can directly contribute to efficiency, quality and profitability for your greenhouse business.
The idea of cooling a greenhouse with thermal buoyancy and wind goes back to the beginning of managed environment. All greenhouses built just before the 1950’s had some type of vents or louvers which were opened to allow the excess heat to flee and cooler outside air to enter.

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

Growers with hoophouses possess found that roll-up sides work 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 can help to have greenhouses made 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 heat is removed by a pressure difference created by wind and temperature gradients. Wind plays the major role. In a well designed greenhouse, a wind quickness 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 top of the vent.