Greenhouse Heating Requirements: Table 2

Air exchanges for greenhouses.

Construction SystemAir Exchanges/ Hour
1. New construction, glass or fiberglass 0.75 to 1.5
2. New construction, double layer PE 0.50 to 1.0
3. Old construcyion, glass, good maintenance 1.00 to 2.0
4. Old construction, glass, poor condition 2.00 to 4.0

(Low wind or protection from the wind reduces the air exchange rate)

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