9#Anniehui 5 ^+ g3 l3 I1 E2 o2 }0 k + p/ n( y( B. b6 x$ sIs 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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My 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.