9#Anniehui + ]- y7 g5 i% }# F4 Z4 J! i p/ i - N9 J3 p e1 R+ ^3 I' F8 N. yIs 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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( _7 [. a! \$ ], _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.