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Hi, I have fitted an extractor hood with a150mm vent at the top. I was just wondering if reducing this vent to 100mm would affect the performance of the fan? the ducting wil go from the canopy through a cladded ceiling and along the joists in the roof space above and out through a grill...

Apologies if this has been asked/answered before. I have only joined today and have trawled through a load of posts but cant find an answer! I have a worcester 28i junior combi boiler, which last week wasnt working. it turned out to be the fan, which was replaced and the central heating and...