Move and refresh the stagnant surroundings in your greenhouse or building to make a healthier and more productive growing environment. These greenhouse exhaust enthusiasts are excellent for reducing 
plant and worker heat tension. Our exhaust enthusiasts provide superb ventilation for high tunnels and cold frames. Create a cooler more comfortable growing environment, which can directly contribute to productivity, quality and profitability for your greenhouse business. Exhaust followers also functions 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 productivity, quality and profitability for your greenhouse business.
The concept of cooling a greenhouse with thermal buoyancy and wind dates back to the start of managed environment. All greenhouses built prior to the 1950’s had some type of vents or louvers that were opened to allow the excess heat to escape and cooler outside atmosphere 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 supporters that draw outside surroundings through louvers in one endwall and exhaust it out the contrary end. With thermostatic control, this is, and still may be the accepted way for cooling many structures where positive air flow movement is needed.
Growers with hoophouses have discovered that roll-up sides work well for warm period ventilation. Both manual and motorized systems can be found. A spot with good summer season breezes and plenty of space between houses is needed. It can help to have greenhouses made with a vertical sidewall up to the elevation of the attachment rail to reduce the amount of rain that may drip in.
Greenhouses with roof and sidewall vents are powered by the principle that heat is Greenhouse Vent Fan removed by a pressure difference created by wind and temperature gradients. Wind plays the major part. In a well designed greenhouse, a wind quickness of 2-3 kilometers/hour provides 80% or even more of the ventilation. Wind moving over the roof creates vacuum pressure 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, great air enters the bottom of the roof vent and the heated are escapes out the very best of the vent.