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Bobbo
Will reducing the size of an extractor hood's vent pipe from 150mm to 100m at the point it exits the house cause problems, if 99% of the rest of the pipe run is 150mm?
Is it a lowest common denominator type thing?
Asking as there's a hole in the wall from the old mains powered but not above cooker extractor fan in the kitchen at the mo, and think it's that smaller than standard 100mm size.