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They are as effective as the work that goes into specifying then installing them, approved document F will point you in the right direction > http://www.planningportal.gov.uk/uploads/br/BR_PDF_ADF_2010.pdf
rive_gauche
@Howard
Existing bathroom is being renovated. No outside facing walls. How effective are the ceiling based extractors and flus? Would mean a five meter trip to the nearest outside facing wall.