9#Anniehui) Y$ r2 Q/ n% Z+ D: E
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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?
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! E! G" N& R( o! TMy 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.