Div. B › Part 9 › 9.32 › 9.32.3 — Mechanical Ventilation

9.32.3.7 — Ventilation Systems Not Coupled with Forced Air Heating Systems

Copied! ▲ ▼

(1) This Article applies to a mechanical ventilation system in a dwelling unit that,

(a) does not contain a forced air heating system, or

(b) contains a forced air heating system which is not used for circulation of the ventilation air.

(2) The mechanical ventilation system shall introduce air to and circulate air throughout the dwelling unit in compliance with this Article.

(3) The mechanical system in this Article shall include a heat recovery ventilator installed in accordance with Article 9.32.3.11.

(4) Outdoor air shall be distributed by a ductwork system from the heat recovery ventilator required in Sentence (3) to each bedroom, to any storey without a bedroom and, if there is no storey without a bedroom, to the principal living area.

(5) A supply duct from the outdoors to the heat recovery ventilator required in Sentence (3) and a main distribution trunk duct shall be provided and shall be sized according to Part 6, except that the supply duct and the main distribution trunk duct may be sized according to Table 9.32.3.7.A. where,

(a) the total duct length from the outdoor hood to any supply register does not exceed 21 m, and

(b) the total number of fittings does not exceed 8.

(6) The outside air supply duct required by Sentence (5) shall not be considered to provide combustion and/or dilution air to fuel-burning appliances.

(7) Branch supply ducts leading from the main distribution trunk duct required by Sentence (5) to the rooms to which outdoor air is to be distributed shall be provided and shall be sized according to Part 6, except that the branch supply ducts may be sized according to Table 9.32.3.7.B. where,

(a) the total duct length from the outdoor hood to any supply register does not exceed 21 m, and

(b) the total number of fittings does not exceed 8.

(8) In applying Sentence (7), where the dwelling unit has more than 5 bedrooms, ducting shall be sized according to Part 6.

(9) All branch supply ducts that are not fitted with diffusers with adjustable balance stops shall be supplied with accessible dampers that can be adjusted and fixed in their adjusted positions and that include devices to indicate the positions of the dampers.

(10) Provision shall be made for the free flow of air to all rooms by leaving gaps beneath doors, using louvred doors or installing grilles in doors.

Tables & Figures referenced

Table 9.32.3.7.A : Minimum Outdoor Air Supply and Main Trunk Duct Sizes : Forming Part of Sentence 9.32.3.7.(5)

Loading Table 9.32.3.7.A…

Table 9.32.3.7.B : Minimum Branch Supply Duct Sizes : Forming Part of Sentence 9.32.3.7.(7)

Loading Table 9.32.3.7.B…

OBC Definitions

Upgrade to view definitions Pro

Defined terms on this page

accessible

means , when applied to a fixture, connection, plumbing appliance, valve, cleanout or equipment, to be accessible with or without having to first remove an access panel, door or similar obstruction, but a fixture, connection, plumbing appliance, valve, cleanout or equipment is not accessible if access can be gained only by cutting or breaking materials.

appliance

means a device to convert fuel into energy and includes all components, controls, wiring and piping required to be part of the device by the applicable standard referred to in this Code.

branch

means a soil or waste pipe that is connected at its upstream end to the junction of two or more soil or waste pipes or to a soil or waste stack and that is connected at its downstream end to another branch, a sump, a soil or waste stack or a building drain.

dwelling unit

means a suite operated as a housekeeping unit, used or intended to be used by one or more persons and usually containing cooking, eating, living, sleeping and sanitary facilities.

size

means the nominal diameter by which a pipe, fitting, trap or other similar item is commercially designated.

storey

means , except for the purposes of Part 7 of Division B, the portion of a building, (a)that is situated between the top of any floor and the top of the floor next above it, or (b)that is situated between the top of the floor and the ceiling above the floor, if there is no floor above it.

supply duct

means a duct for conveying air from a heating, ventilating or air-conditioning appliance to a space to be heated, ventilated or air-conditioned.

On this page

Top
Tables
Related