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Is it your greenhouse ? Look like it is a kind of transparent sheet attached to the wood frame, not glass or anything, right?
. Z9 M3 q) @ { ! d' s8 O7 a4 E1 Q3 |. N6 q3 pMy husband seals the plastic layers himself, then use a small fan to blow air between the two layers. The plastic can only be bought at Horticulture supply stores.