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Greenhouse roof vent placement.
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.
The exhaust fans mounted high will help pull the cool air through the greenhouse and take the heat out of the ceiling.
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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.
Heat rises so it is generally advantageous to place exhaust fans toward the top of a greenhouse.
This will create a path of airflow across the entire greenhouse which makes a ventilation system operate more efficiently.
Roof and side vents on conventional greenhouses need to be large enough to get good air movement.
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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Place the exhaust fans high on wall at the opposite end.
With a greenhouse your size use a 100 000 cfm evaporative cooler mounted on one wall so the cool air blows over the benches.
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Greenhouse roof vents work really well as they are located where hot air gathers naturally at the peak of the roof.
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.