PlumbingIQ
Sign InGet Started
PlumbingIQ

Learning

DashboardFlashcardsMy Progress

Testing & Mocks

Mock Exams

Account

Upgrade to Pro

⭐ Upgrade to Pro - £19

Unlock all lessons and mock exams to pass Level 2 + Level 3 theory exams.

Upgrade now
Lesson 21 of 22

Flue Testing Procedures

Read through the material below, then test your understanding.

Module Lessons

Domestic Fuel Systems, Combustion & Flues

Lesson Overview

Flue testing ensures appliances evacuate hazardous combustion products safely to the outside atmosphere in full compliance with BS 5440-1.

Learning Objectives

Carry out thorough pre-installation visual inspections of chimneys and flues.

Perform a compliant flue flow test using standard smoke pellets.

Conduct an appliance spillage test under adverse room draught conditions.

Unlock the full lesson & knowledge check

Get lifetime access to every Level 2 & 3 lesson, 3500+ total questions, and timed City & Guilds mock exams.

Get Pro Access (£19)

Already have Pro? Sign in

PlumbingIQ

Interactive City & Guilds Level 2 and Level 3 plumbing lessons, flashcards and mock exams, built for UK students and professionals.

© 2026 PlumbingIQ. All rights reserved.