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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?
8 W8 k: f, g- D7 q; M1 j- ?4 @ 6 M2 G& H6 ~/ lMy 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.