A-3 Gas Appliance and Building Air Requirements

Plumber Apprenticeship Program – Level 2

"Diagram showing the air supply for a gas appliance, illustrating the flow of combustion air (primary and secondary), excess air, and dilution air through the system, with heated supply air and cool return air."
Type of gas appliance air supply. (Skilled Trades BC, 2021) Used with permission.

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Block A: Fuel Gas Copyright © 2025 by Skilled Trades BC, TRU Open Press is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License, except where otherwise noted.

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