The Ontario Building Code | Ventilation Systems Coupled with Forced Air Heating Systems
9.32.3.6. ventilation Systems Coupled with Forced Air Heating Systems
(1) This Article applies to a mechanical ventilation system in a dwelling unit that contains a forced air heating system which is used for delivery of ventilation air.
Note: On July 1, 2017, Sentences 9.32.3.6.(1) of Division B of the Regulation is revoked and the following substituted: (See: O. Reg. 139/17, s. 128)
(1) This Article applies to a mechanical ventilation system serving a houseor an individual dwelling unit that contains a forced air heating system which is used for delivery of ventilation air.
(2) In a Type I dwelling unit, a ventilation supply inlet is not required.
Note: On July 1, 2017, Sentences 9.32.3.6.(2) of Division B of the Regulation is revoked and the following substituted: (See: O. Reg. 139/17, s. 128)
(2) Where a mechanical ventilation system serves a Type I dwelling unit, a ventilation supply inlet is not required.
(3) In a Type II dwelling unit, the mechanical ventilation system shall include a heat recovery ventilator, coupled to the forced air heating system, installed in accordance with Article 9.32.3.11.
Note: On July 1, 2017, Sentences 9.32.3.6.(3) of Division B of the Regulation is revoked and the following substituted: (See: O. Reg. 139/17, s. 128)
(3) Where a mechanical ventilation system serves a Type II dwelling unit, the system shall include a heat recovery ventilator, coupled to the forced air heating system, installed in accordance with Article 9.32.3.11.
(4) The forced air heating system circulation fan shall be controlled by a manual switch located adjacent to the ventilation fan switch required in Sentence 9.32.3.4.(4).
(5) The switch required in Sentence (4) shall be identified by the words CIRCULATION FAN.
In Plain Language
Where a ventilation system is coupled with a forced air heating system, this article sets out the specific requirements that apply to that combined arrangement.
This is a plain-language summary of the 2012/2017 Ontario Building Code text above, for general understanding only and not a substitute for the Code. Always confirm current requirements against the 2024 edition (O.Reg. 163/24) or a qualified professional before construction.