Move and refresh the stagnant atmosphere in your greenhouse or building to make a healthier and more productive growing environment. These greenhouse exhaust supporters are great 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, which can directly contribute to productivity, quality and profitability for your greenhouse business. Exhaust followers 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 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 got some type of vents or Greenhouse Vent Fan louvers that were opened to enable the excess heat to escape and cooler outside air to enter.
When polyethylene was developed 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 surroundings through louvers in one endwall and exhaust it out the contrary end. With thermostatic control, this was, and still may be the accepted method for cooling many structures where positive atmosphere movement is needed.
Growers with hoophouses have discovered that roll-up sides work very well for warm period ventilation. Both manual and motorized systems are available. A spot with good summertime breezes and lots of space between houses is needed. It helps to have greenhouses designed with a vertical sidewall up to the elevation of the attachment rail to lessen the amount of rain that can drip in.
Greenhouses with roof and sidewall vents operate on the principle that warmth is removed by a pressure difference created by wind and temperature gradients. Wind plays the major role. In a smartly designed greenhouse, a wind swiftness of 2-3 miles/hour provides 80% or more of the ventilation. Wind moving 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 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.