If vents in the roof are not possible make sure to at least have a window to two you can open.
Greenhouse roof vent placement.
Greenhouse roof vents work really well as they are located where hot air gathers naturally at the peak of the roof.
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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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This will create a path of airflow across the entire greenhouse which makes a ventilation system operate more efficiently.
Place the exhaust fans high on wall at the opposite end.
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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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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.
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.
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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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