9#Anniehui 2 G3 i$ U+ ^: ^1 y! B " d% D* t6 O4 PIs 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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It's two layers of greenhouse plastic that is inflated with air.
14#Anniehui 7 t/ Y( X. Z/ G# L5 s, c3 K8 T9 X * y k' x+ | T# W4 D$ ^6 ~Is it a specific kind designed to hold air like a balloon? where it is available ?
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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.