Extract fan ducting requirements

Issue 37 – April 2012

House inspections highlight a continuing issue with the installation of extract fans and dryers and their associated ducting. Too often, the ducting does not vent to the outside (it discharges into a roof space), and ducts are often installed in a way that restricts their performance – examples are folds and creases in flexible ducting that constrict the flow.

Published in building.