Move and refresh the stagnant atmosphere in your greenhouse or building to create a healthier and more productive growing environment. These greenhouse exhaust fans are great for reducing plant and worker heat stress. Our exhaust enthusiasts provide exceptional ventilation for high tunnels and cold frames. Create a cooler convenient growing environment, that may directly contribute to efficiency, quality and Greenhouse Exhaust Fan profitability for your greenhouse business. Exhaust fans also works great in workshops and buildings.
Move and refresh the stagnant air in your greenhouse to make a healthier and more productive environment. These exhaust & circulating fans are excellent for plant development. Create a cooler more comfortable growing environment, which can directly contribute to productivity, quality and profitability for your greenhouse business.
The idea of cooling a greenhouse with thermal buoyancy and wind goes back to the beginning of controlled environment. All greenhouses built prior to the 1950’s experienced some kind of vents or louvers which were opened to allow the excess heat to escape and cooler outside atmosphere to enter.

When polyethylene originated with large sheets within the whole roof, placing vents on the top proved difficult. Engineers then came up with the idea of using fans that attract outside surroundings 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 possess discovered that roll-up sides work well for warm season ventilation. Both manual and motorized systems can be found. A spot with good summer season breezes and plenty of space between homes is needed. It helps to have greenhouses designed with a vertical sidewall up to the elevation of the attachment rail to lessen the quantity of rain that may drip in.

Greenhouses with roof and sidewall vents operate on the principle that 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 swiftness of 2-3 kilometers/hour provides 80% or even more of the ventilation. Wind passing over the roof creates a vacuum and sucks the heated air flow out the vent. If sidewall vents are open, cool replacement air flow 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 very best of the vent.