OBC 2006 › Division B

9.32.3.10.

Version 0 — in force 31 December 2006

In force

Verified · covered Verified against the 2006-12-31–2007-04-01 consolidation, whose range covers the query date. How to read this

In force

Verified · covered Verified against the 2006-12-31–2007-04-01 consolidation, whose range covers the query date. How to read this

Provenance

OBC 1997 · continues from 9.32.3.10. — Pro

Base · O. Reg. 350/06 · ext← current

Original — base regulation

O. Reg. 503/09, cl. 192(2) · ext v1 →

In force 2010-01-01

Next: O. Reg. 503/09, cl. 192(2) · ext (not in force until 2010-01-01) v1 →

OBC 2012 · continues as 9.32.3.10. — Pro

9.32.3.10. — Ducts

(1) Ventilation ducts shall conform to the requirements of Part 6 for supply ducts except that exhaust ducts that serve only a bathroom or water closet room may be of combustible material provided the duct is reasonably airtight and constructed of a material impervious to water.

(2) Exhaust ducts shall not discharge into heated or unheated enclosed spaces.

(3) Where an exhaust duct passes through or is adjacent to unheated space, the duct shall be insulated to not less than RSI 0.5.

(4) Where a supply duct carrying outdoor air that is not tempered or not mixed with indoor air passes through heated space, it shall be insulated to not less than RSI 0.5 except that, where such a duct is exposed in the heated space for more than 3 m of length in the heated space, it shall be insulated to not less than the values listed in Table 9.32.3.10.A.

(5) A kitchen exhaust duct not equipped with a filter at the inlet end shall be designed and installed so that the entire duct can be cleaned.

(6) Ductwork for range hoods and range-top fans shall be of noncombustible, corrosion-resistant material and shall lead directly to the outdoors without connection to other exhaust fans or ducts.

(7) Ductwork for range hoods and range-top fans shall be equipped with a grease filter at the intake.

(8) All ductwork shall be permanently supported or clipped to prevent sagging, excessive movement and vibration.

(9) All ducting connected to supply and exhaust fans shall be constructed so as to inhibit air leakage at joints.

(10) Where rectangular duct is used in place of round duct, it shall be selected according to Table 9.32.3.10.B.

Editor's note

This map follows the as-filed text of O. Reg. 350/06, whose member dimensions in the tables under Article 9.32.3.10. use the letter 'x' (e.g. '82 x 250'). The e-Laws consolidation editorially substitutes the multiplication sign '×'; no amending regulation makes this change.

Text · e-Laws consolidated snapshot

Table 9.32.3.10.A. Insulation of Fresh Air Supply Ducts Forming Part of Sentence 9.32.3.10.(4)

Column 1	Column 2
Outside Winter Design Temperature as per Supplementary Standard SB-1⁽¹⁾, °C	Minimum Thermal Resistance, RSI
–7 to –11	0.5
–12 to –17	0.9
–18 to –24	1.2
–25 to –29	1.4
–30 to –34	1.8
–35 and colder	2.1

Notes to Table 9.32.3.10.A:

(1) The outside winter design temperatures shall be those listed for the January 2.5 percent values.

Table 9.32.3.10.B. Equivalent Duct Sizes Forming Part of Sentence 9.32.3.10.(10)


Column 1	Column 2	Column 3	Column 4	Column 5
Required Round Duct Size, mm	Permitted Equivalent Rectangular Duct Size, mm
Required Round Duct Size, mm	Stack Duct	100 mm Depth	125 mm Depth	150 mm Depth
75	82 × 250	57 × 100
100	82 × 250	89 × 100	75 × 125	75 × 150
125	82 × 250	125 × 100	100 × 125	89 × 150
150	82 × 300	200 × 100	150 × 125	125 × 150
175	82 × 350	275 × 100	200 × 125	175 × 150
More than 175	Part 6 design	Part 6 design	Part 6 design	Part 6 design