greenhouse vent fan

Move and refresh the stagnant surroundings in your greenhouse or building to create a healthier and more productive growing environment. These greenhouse exhaust supporters are great for reducing plant and employee heat stress. Our exhaust enthusiasts provide exceptional ventilation for high tunnels and cool frames. Create a Greenhouse Vent Fan cooler convenient growing environment, which can directly contribute to efficiency, quality and profitability for your greenhouse business. Exhaust enthusiasts also works great in workshops and structures.
Move and refresh the stagnant air 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, 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 constructed prior to the 1950’s acquired some kind of vents or louvers that were opened to enable the excess heat to escape and cooler outside surroundings to enter.

When polyethylene was developed with large sheets covering the whole roof, putting vents on the top proved difficult. Engineers then came up with the concept of using supporters that draw outside air 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 air movement is needed.

Growers with hoophouses have discovered that roll-up sides work very well for warm season ventilation. Both manual and motorized systems can be found. A spot with good summer breezes and plenty 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 lessen the amount of rain that may drip in.

Greenhouses with roof and sidewall vents are powered by the principle that warmth is removed by a pressure difference created by wind and temperature gradients. Wind performs the major role. In a smartly designed greenhouse, a wind velocity of 2-3 miles/hour provides 80% or more of the ventilation. Wind moving over the roof creates a vacuum and sucks the heated surroundings out the vent. If sidewall vents are open up, cool replacement atmosphere enters and drops to the ground 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.