PART 9 — HOUSING AND SMALL BUILDINGSUpdated for the 2024 Ontario Building Code
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9.32.3.10.Fans (See Note A-9.32.3.10.)
(1) Except as provided in Sentence (4), capacity ratings for required fans shall be determined in accordance with
(a) CAN/CSA-C260-M, “Rating the Performance of Residential Mechanical Ventilating Equipment,” or
(b) HVI Publication 916, “Airflow Test Procedure.”
(2) Sound ratings for fans shall be determined in accordance with
(a) CAN/CSA-C260-M, “Rating the Performance of Residential Mechanical Ventilating Equipment,” or
(b) HVI Publication 915, “Loudness Testing and Rating Procedure.”
(3) Capacity ratings for fans shall be measured at the external static pressure differentials shown in Table 9.32.3.10.-A.
Table 9.32.3.10.-A
Minimum External Static Pressure Differential for Rating of Fans
Forming Part of Sentence 9.32.3.10.(3)
Minimum External Static Pressure Differential to be Used in Determining
Fan Configuration or Application
Rated Capacity
Fans installed with ducts connected on both sides, any
100 Pa (0.4 inch water column)
application
Fans installed with ducts on one side only, used as the
principal ventilation fan in exhaust-only systems 62 Pa (0.25 inch water column)
permitted by Article 9.32.3.6.
Other required fans 25 Pa (0.1 inch water column)
(4) Fans in heat recovery ventilators used to provide one or more required fans shall have their airflow at normal
temperature rated in accordance with CAN/CSA-C439, “Standard laboratory methods of test for rating the performance of
heat/energy-recovery ventilators.”
(5) Where a heat recovery ventilator is used to provide one or more required fans, it shall have a low-temperature
ventilation reduction factor of not less than 50% when tested in accordance with CAN/CSA-C439, “Standard laboratory
methods of test for rating the performance of heat/energy-recovery ventilators,” at an outdoor temperature at least as low
as the outdoor design temperature for the location where the ventilation system is to be installed, but the outdoor design
temperature need not be lower than -25°C.
(6) Fans, including make-up air supply fans, installed to satisfy Articles 9.32.3.3. to 9.32.3.8. with less than 1 m of duct
between themselves and the visible interior surfaces of rooms other than unfinished basements, furnace rooms, utility
rooms and attics, shall have a sound rating complying with Table 9.32.3.10.-B when operating at the required flow rate.
(7) Mechanical ventilation devices shall conform to CSA C22.2 No. 113, “Fans and Ventilators.”
Table 9.32.3.10.-B
Maximum Sound Rating for Fans
Forming Part of Sentence 9.32.3.10.(6)
Maximum Sound Rating, sones
Fan Application
Rated according to CAN/CSA-C260-M Rated according to HVI 915
Principal exhaust fan 2.0 2.5
Supplemental exhaust fans installed in bathrooms and
2.5 3.5
their make-up air fans
Supplemental exhaust fans installed in kitchens and their
no rating required no rating required
make-up air fans
This provision includes a table — formatting is preserved from the source; refer to the official code for the authoritative layout.
← Previous9.32.3.9C. Installation and Conformance to StandardsNext →9.32.3.11. Ducts (See Note A-9.32.3.11.)
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Code text is reproduced for reference from the Ontario Building Code (O. Reg. 163/24, 2024 Building Code Compendium). This page is provided for general information and is not an official copy. Always verify requirements against the official Ontario Building Code and confirm with your local building department.