Move and refresh the stagnant atmosphere in your greenhouse or building to make a healthier and more productive growing environment. These greenhouse exhaust followers are excellent for reducing plant and worker heat tension. Our exhaust fans provide superb 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 supporters also works great in workshops and buildings.
Move and refresh the stagnant atmosphere 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, that may directly contribute to productivity, 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 built just before the 1950’s experienced some type of vents or louvers that were opened to allow the excess heat to flee and cooler outside surroundings 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 concept of using enthusiasts that pull outside air flow through louvers in a single endwall and exhaust it out the opposite end. With thermostatic control, this was, and still may be the accepted method for cooling many structures where positive surroundings movement is needed.
Growers with hoophouses have found that roll-up sides work well for warm period ventilation. Both manual and motorized systems can be found. A location with good summer time breezes and lots of space between houses is needed. It helps to have greenhouses made with a vertical sidewall up to the height 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 heat is removed by a pressure Greenhouse Exhaust Fan difference created by wind and temperature gradients. Wind plays the major part. In a well designed greenhouse, a wind velocity of 2-3 miles/hour provides 80% or even more of the ventilation. Wind passing over the roof creates vacuum pressure and sucks the heated surroundings out the vent. If sidewall vents are open, cool replacement surroundings enters and drops to the floor level. If the sidewall vents are closed, great air enters the bottom of the roof vent and the heated are escapes out the very best of the vent.
