Natural Swimming Pools: A Guide to Building (Hardcover)
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Posted By: tonySounds like a bad idea to me, is it for ventilation or draughts?
Posted By: GaryBA standard door can pass 70 litres/sec at a pressure differential of 15 Pa.
Posted By: tonyI leave a gap at the bottom of the door for that!
Posted By: GaryBIf the door is fire rated then it should have intumescent strips rebated into the bottom of the door as well.
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