The exhaust fans mounted high will help pull the cool air through the greenhouse and take the heat out of the ceiling.
Greenhouse roof vent placement.
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With a greenhouse your size use a 100 000 cfm evaporative cooler mounted on one wall so the cool air blows over the benches.
If possible place intake vents or fans lower to the ground preferably on the opposite side of the greenhouse than the exhaust.
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Roof and side vents on conventional greenhouses need to be large enough to get good air movement.
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Ideally you want to have cross ventilation so two windows on two sides of the greenhouse work best.
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If vents in the roof are not possible make sure to at least have a window to two you can open.
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The american society of agricultural engineers recommends that the combined sidewall vent area should equal the combined ridge vent area and each should be 15 to 20 of the floor area.
Determine your greenhouse s total amount of roof area by measuring the length and width of your greenhouse roof panels in inches and multiplying the measurements by each other.
This will create a path of airflow across the entire greenhouse which makes a ventilation system operate more efficiently.
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