A commonly asked question is whether Air Admittance Valves (AAVs) can be installed outside. In the UK Part H of the Building Regulations 2010 (clause 1.33) states that “Air admittance valves should not be used outside buildings.
What is an active carbon filter for drainage? It is a two-way vent that uses active carbon as a filter to absorb the sewer gases (primarily hydrogen sulphide H₂S and methane CH4) which come out of a drainage vent.
Dr. Michael Gormley is a specialist in water supply and drainage as well as an electrical building services engineer. Here he shares with us here about his work on completing the book Transient Free Surface flows in Building Drainage Systems.