Move and refresh the stagnant air in your greenhouse or building to create a healthier and more productive growing environment. These greenhouse exhaust followers are excellent for reducing plant and worker heat tension. Our exhaust supporters provide exceptional ventilation for high tunnels and frosty frames. Create a cooler more comfortable growing environment, which can directly contribute to efficiency, quality and profitability for your greenhouse business. Exhaust enthusiasts also functions great in workshops and buildings.
Move and refresh the stagnant surroundings in your greenhouse to make a healthier and more productive environment. These exhaust & circulating fans are excellent for plant growth. Create a cooler convenient growing environment, that may directly contribute to productivity, quality and profitability for your greenhouse business.
The idea of cooling a greenhouse with thermal buoyancy and wind dates back to the beginning of controlled environment. All Greenhouse Exhaust Fan greenhouses built just before the 1950’s had some form of vents or louvers that were opened to enable the excess heat to escape and cooler outside air to enter.

When polyethylene originated with large sheets covering the whole roof, placing vents on the top proved difficult. Engineers then came up with the idea of using followers that attract outside air through louvers in a single endwall and exhaust it out the contrary end. With thermostatic control, this is, and still is the accepted way for cooling many structures where positive air flow movement is needed.

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

Greenhouses with roof and sidewall vents operate on the principle that warmth is removed by a pressure difference created by wind and temperature gradients. Wind plays the major role. In a smartly designed greenhouse, a wind acceleration of 2-3 miles/hour provides 80% or more of the ventilation. Wind moving over the roof creates vacuum pressure and sucks the heated air out the vent. If sidewall vents are open, cool replacement surroundings enters and drops to the floor level. If the sidewall vents are closed, cool air enters the bottom of the roof vent and the heated are escapes out the top of the vent.