9#Anniehui ( M* R( C6 i) _* p9 G! r5 Z* g% [) q( e
Is it your greenhouse ? Look like it is a kind of transparent sheet attached to the wood frame, not glass or anything, right?
# ^& z& V6 K- |" z4 r' RMy 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.