Move and refresh the stagnant air in your greenhouse or building to create a healthier and more productive developing environment. These greenhouse exhaust fans are excellent for reducing plant and employee heat stress. Our exhaust followers provide exceptional ventilation for high tunnels and frosty frames. Create a cooler convenient growing environment, that may directly contribute to productivity, quality and profitability for your greenhouse Greenhouse Exhaust Fan business. Exhaust fans also works great in workshops and structures.
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 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 goes back to the beginning of managed 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 atmosphere 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 fans that attract outside air flow through louvers in one endwall and exhaust it out the contrary end. With thermostatic control, this is, and still may be the accepted method 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 location with good summertime breezes and plenty of space between homes is needed. It can help to have greenhouses designed with a vertical sidewall up to the height of the attachment rail to lessen the amount of rain that can drip in.
Greenhouses with roof and sidewall vents are powered by the principle that heat is removed by a pressure difference created by wind and temperature gradients. Wind performs the major role. In a well designed greenhouse, a wind speed of 2-3 miles/hour provides 80% or even more of the ventilation. Wind moving over the roof creates a vacuum and sucks the heated air out the vent. If sidewall vents are open, cool replacement surroundings enters and drops to the ground 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.