greenhouse vent fan

Move and refresh the stagnant atmosphere in your greenhouse or building to create a healthier and more productive growing environment. These greenhouse exhaust supporters are great for reducing plant and employee heat tension. Our exhaust supporters provide superb ventilation for high tunnels and cold frames. Create a cooler convenient growing environment, that may directly contribute to productivity, quality and profitability for your greenhouse business. Exhaust supporters 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 excellent for plant growth. Create a cooler convenient 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 dates back to the start of controlled environment. All greenhouses built prior to the 1950’s acquired some kind of vents or Greenhouse Vent Fan louvers which were opened to enable the excess heat to flee and cooler outside atmosphere to enter.

When polyethylene was developed with large sheets within the whole roof, putting vents on the top proved difficult. Engineers then came up with the concept of using followers that draw outside atmosphere through louvers in one endwall and exhaust it out the contrary end. With thermostatic control, this is, and still is the accepted method for cooling many structures where positive atmosphere movement is needed.

Growers with hoophouses possess 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 helps to have greenhouses designed with a vertical sidewall up to the height of the attachment rail to lessen the amount of rain that may 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 part. In a smartly designed greenhouse, a wind quickness of 2-3 miles/hour provides 80% or even 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 air flow enters and drops to the ground level. If the sidewall vents are closed, great air enters underneath of the roof vent and the heated are escapes out the top of the vent.

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