G3 Venting and Combustion Products: What's Tested and How to Study It
Vent systems, categories, draft, and safely removing the products of combustion.
Venting is where a mistake is most likely to hurt somebody, and the exam treats it accordingly. Expect questions on vent sizing, materials, termination and what each appliance category requires.
What does the G3 exam test on Venting and Combustion Products?
Vent systems, categories, draft, and safely removing the products of combustion. The question bank holds 77 questions in this area,
out of 1,184 across the whole syllabus.
Appliance categories I to IV and the vent each demands
Vent materials, and matching them to the appliance
Draft, and what disturbs it
Vent termination clearances
Common venting and shared vent systems
Spillage and how it is detected
How should you study Venting and Combustion Products for the G3 exam?
Get the four appliance categories straight first — positive or non-positive vent pressure, flue loss above or below 17%. Much of the rest follows from knowing which category you are dealing with.