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Is 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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Is it a specific kind designed to hold air like a balloon? where it is available ?
15#ceramistpalace ) b( G5 L; \, z3 w & x$ c O0 B: u 5 F( \/ j" c! mMy 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.