Move and refresh the stagnant air flow in your greenhouse or building to make a healthier and more productive growing environment. These greenhouse Greenhouse Vent Fan exhaust supporters are great for reducing plant and employee heat stress. Our exhaust supporters provide excellent ventilation for high tunnels and frosty 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 create a healthier and more productive environment. These exhaust & circulating fans are great for plant growth. Create a cooler more comfortable growing environment, that may 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 constructed just before the 1950’s got some form of vents or louvers that were opened to allow the excess heat to flee and cooler outside air to enter.

When polyethylene was developed with large sheets covering the whole roof, placing vents on the roof proved difficult. Engineers then came up with the idea of using enthusiasts that pull 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 way for cooling many structures where positive atmosphere movement is needed.

Growers with hoophouses have discovered 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 are powered by the principle that warmth is removed by a pressure difference created by wind and temperature gradients. Wind performs the major part. In a smartly designed greenhouse, a wind quickness 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 surroundings 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 underneath of the roof vent and the heated are escapes out the top of the vent.