- 18 May 2007
- Reaction score
Can anybody suggest a reason why I shouldn't have ducted my cooker extractor fan into an internal 110mm waste stack (mushroom fitted on top). Waste stack is full of fresh air (no smells at all) and duct is fitted with spring-loaded in-line backdraft shutter as additional precaution. Connection by 125mm aluminium duct into 110mm branch 2m from mushroom on roof. Works a treat and no finding an external wall, knocking a hole etc etc. I'm sure there'll be a byelaw somewhere...