Move and refresh the stagnant air in your Greenhouse Exhaust Fan greenhouse or building to make a healthier and more productive growing environment. These greenhouse exhaust followers are great for reducing plant and worker heat tension. Our exhaust enthusiasts provide excellent ventilation for high tunnels and cool frames. Create a cooler convenient growing environment, which can directly contribute to efficiency, quality and profitability for your greenhouse business. Exhaust fans also functions great in workshops and structures.
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 development. 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 dates back to the start of managed environment. All greenhouses constructed just before the 1950’s had some type of vents or louvers which were opened to enable the excess heat to escape and cooler outside surroundings to enter.

When polyethylene originated with large sheets within the whole roof, putting vents on the roof proved difficult. Engineers then came up with the concept of using supporters that attract outside atmosphere through louvers in a single endwall and exhaust it out the contrary end. With thermostatic control, this is, and still may be 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 time of year ventilation. Both manual and motorized systems can be found. A spot with good summer time 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 reduce the amount of rain that can 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 role. In a well 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 air enters and drops to the ground level. If the sidewall vents are closed, awesome air enters underneath of the roof vent and the heated are escapes out the very best of the vent.