The Ontario Building Code | Natural Ventilation Area

9.32.2.1. Natural ventilation Area

(1) The unobstructed openable ventilation area to the outdoorref ="http://thehandyforce.com/doors/" title ="Toronto Door installer">doors for rooms and spaces in residential buildings ventilated by natural means shall conform to Table 9.32.2.1.

Note: On July 1, 2017, Sentence 9.32.2.1.(1) of Division B of the Regulation is amended by striking out "residential buildings" and substituting "a residential occupancy". (See: O. Reg. 139/17, s. 126)

Table 9.32.2.1.
Natural ventilation

Forming Part of Sentence 9.32.2.1.(1)

Item	Column 1	Column 2	Column 3
	Location		Minimum Unobstructed Area
1.	Within a dwelling unit	Bathrooms or water closet rooms	0.09 m²
		Unfinished basement space	0.2 percent of the floor area
		Dining rooms, living rooms, bedrooms, kitchens, combined rooms, dens, recreation rooms and all other finished rooms	0.28 m² per room or combination of rooms
2.	Other than within a dwelling unit	Bathrooms or water closet rooms	0.09 m² per water closet
		Sleeping areas	0.14 m² per occupant
		Laundry rooms, kitchens, recreation rooms	4 percent of the floor area
		corridors, storage rooms and other similar public rooms or spaces	2 percent of the floor area
		Unfinished basement space not used on a shared basis	0.2 percent of the floor area

(2) Where a vestibule opens directly off a living or dining room within a dwelling unit, ventilation to the outdoorref ="http://thehandyforce.com/doors/" title ="Toronto Door installer">doors for such rooms may be through the vestibule.