MarkhamBuilding InspectionsInspections

Principal Ventilation System

Published by City of Markham

This is the City of Markham’s document, as published on its website on 18 October 2026. The municipality may have changed it since: check the current version at the source. Legal notice

Type: Map
Published by: City of Markham
Date: January 1, 2025
Also called: Principal Exhaust Fan Controls
For: builder
Building types: All building types
Pages: 2

Overview

Builder Tip Issue No. 3, which the City of Markham lists as Principal Exhaust Fan Controls among its housing tips under the 2024 Ontario Building Code; dated January 1, 2025. It quotes Sentences (2) to (7) of Article 9.32.3.3., Principal Ventilation System: the normal operating exhaust capacity, a single fan, heat recovery ventilator or controlled group of fans, continuous-operation approval, and the manual switch or dehumidistat override marked VENTILATION FAN. The Objective ties mechanical ventilation to indoor air quality and homeowners' control of the system.

What it covers

9.32.3.3. Principal Ventilation System
Objective

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