9#Anniehui 1 {! ]$ X! D0 z2 t8 @6 y / R! ^7 u- |0 P7 _4 IIs 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.