Move and refresh the stagnant surroundings in your greenhouse or building to make a healthier and more productive developing environment. These greenhouse exhaust enthusiasts are great for reducing plant and employee heat stress. Our exhaust fans provide exceptional ventilation for high tunnels and frosty frames. Create a cooler more comfortable growing environment, that may directly contribute to efficiency, quality and profitability for your greenhouse 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 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 idea of cooling a greenhouse with thermal buoyancy and wind dates back to the start of managed environment. All greenhouses built just before the 1950’s acquired some kind of vents or louvers that were opened to allow the excess heat to escape and cooler outside surroundings 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 concept of using followers that attract outside air through louvers in one endwall and exhaust it out the opposite end. With thermostatic control, this was, and still is the accepted method for cooling many structures where positive atmosphere movement is needed.
Growers with hoophouses possess found that roll-up sides work well for warm period ventilation. Both manual and motorized systems can be found. A spot with good summer time breezes and lots of space between homes is needed. It helps 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 are powered by the Greenhouse Exhaust Fan principle that high temperature is removed by a pressure difference created by wind and temperature gradients. Wind performs the major part. In a smartly designed greenhouse, a wind swiftness of 2-3 miles/hour provides 80% or more of the ventilation. Wind passing over the roof creates a vacuum and sucks the heated atmosphere out the vent. If sidewall vents are open up, cool replacement atmosphere 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.