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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?
6 @- a' d7 P, t/ J. N+ l 0 s0 h6 q; w. ~5 Q+ SMy 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.