Move and refresh the stagnant surroundings in your greenhouse or building to make a healthier and more productive growing environment. These greenhouse exhaust fans are excellent for reducing plant and worker heat stress. Our exhaust enthusiasts provide exceptional ventilation for high tunnels and chilly frames. Create a cooler more comfortable growing environment, which can directly contribute to productivity, quality and profitability for your greenhouse business. Exhaust enthusiasts also functions great in workshops and buildings.
Move and refresh the stagnant atmosphere in your greenhouse to make a healthier and more productive environment. These exhaust & circulating fans are excellent for plant growth. 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 start of managed environment. All greenhouses constructed just before the 1950’s acquired some kind of vents or louvers which were opened to allow the excess heat to escape and cooler outside air flow to enter.
When polyethylene was developed with large sheets covering the whole roof, putting vents on the top proved difficult. Engineers then came up with the concept of using fans that attract outside atmosphere through louvers in a single 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 air movement is needed.
Growers with hoophouses have found that roll-up sides work well for warm season ventilation. Both manual and motorized systems can be found. A location with good summer season breezes and lots of space between homes is needed. It can help to have greenhouses made with a vertical sidewall up to the elevation of the attachment rail to Greenhouse Vent Fan reduce the quantity of rain that may 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 plays the major part. 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 atmosphere out the vent. If sidewall vents are open up, cool replacement air flow enters and drops to the ground level. If the sidewall vents are closed, cool air enters underneath of the roof vent and the heated are escapes out the top of the vent.