Last edited 09 Oct 2017

Appliance ventilation duct

The building regulations Approved Document B, ‘Fire safety’ defines an appliance ventilation duct as:

A duct provided to convey combustion air to a gas appliance.

Where an appliance ventilation duct passes through a compartment wall or compartment floor, or is built into a compartment wall, each wall of the duct should have a fire resistance of at lease half the wall or floor in order to prevent the by-passing of the compartmentation.

[edit] Find out more

[edit] Related articles on Designing Buildings Wiki