18-28-403.3.8 Outside air requirements.

   If a mechanical exhaust system is required, the outside air needed to replace the air exhausted from each room shall be obtained from ventilation openings in that room or from a mechanical ventilating supply system installed for that room.

   Exceptions:

      1.   In foyers, living quarters, offices, rest rooms, lobbies, locker rooms, medicine rooms and picture galleries, ventilation also may be obtained from a mechanical ventilating supply system serving rooms adjacent to the designated room, either alone or in combination with the designated room, if the quantity of air supplied to the adjacent room is not less than that required for both the designated room and the adjacent rooms.

      2.   In public kitchens and serving pantries, ventilation air may be obtained through ventilation openings from dining rooms adjacent to designated rooms, if the area of the ventilation openings in the dining room is not less than 4 percent of the combined floor area of the dining room and the kitchen or serving pantry. Such ventilation comply with the following:

         2.1   If the dining room is provided with a mechanical supply system of ventilation, air from the dining room can be taken through proper openings into the kitchen and exhausted from the kitchen. Such air shall be considered as exhaust from the dining room and as supply air into the kitchen.

         2.2    A kitchen exhaust system need not be increased beyond the requirements for kitchen exhaust as indicated in Table 18-28-403.3.

         2.3   If the amount of air exhausted from the dining room through the kitchen is not sufficient to provide exhaust as indicated in Table 18-28-403.3, additional exhaust shall be taken from the dining room area to make up such requirement, either by increasing exhaust from the kitchen or by installing a separate additional mechanical exhaust system.

      3.   In bath, toilet, and urinal rooms, check rooms, storage room, storage battery rooms, telephone switch rooms, and other rooms of similar character, ventilation may be obtained from ventilation openings in these rooms or from openings to uncontaminated rooms adjacent to the designated rooms if the following requirement is met:

         3.1   The quantity of air supplied to the adjacent rooms is not less than the air exhausted through the designated rooms.

Table 18-28-403.3
Ventilating Requirements*

For a printer-friendly PDF version of Table 18-28-403.3, please click here.

* S = Mechanical Supply; E = Mechanical Exhaust From Room; RO = Relief Opening; NR = No Requirement; NV = Natural Ventilation; Vent opening = percentage of floor area.

Room Purpose	Vent Opening Percent of Floor Area		Mechanical Ventil. CFM/SF		Remarks
	Less Than	Not Less Than	S, Supply	E, Room Exhaust
Correctional
Cell rooms		4	0	0
	4		1.2	1.2
Dry Cleaners/Laundries
Dry Cleaning		4	0	4	See 18-28-403.3.3.
	4		1.5	4
Laundries (Residential for less than 30 units)		4	0	0
	4		0	1
Laundries serving general public			1.5	1.5	See 18-28-403.3.3.
Linen Rooms			0.5	0.5
Education
Music Rooms		4	0	0
	4		1.5	0.75
Class Rooms/Auditoriums		4	0	0
	4		1.5	0.75
Cooking Rooms for Instruction only		4	0	1.5
	4		1.0	1.5
Libraries/Reading Rooms		4	0	0
	4		1.2	0.6
Food and Beverage Service
Cafeterias/Food Courts		4	0	0
	4		1.5	2.0
Public Dining Rooms - no cooking equipment		4	0	0
	4		1.5	1.5
Public Dining Rooms - with cooking equipment		4	0	2
	4		1.5	2
Grills		1	0	2
	1		1.5	2
Kitchen, public		3	0	4	See Note 5.
	3		1.2	4
Lounges/Bars		4	0	0
	4		1.0	1.5
Health Care
Anesthesia Storage Rooms			1.2	1.2	See Note 5.
Autopsy Rooms			1.5	3.0	See Note 5.
Doctor's - Dentist exam rooms		4	0	0
	4		0.6	0.3
Delivery Rooms/Birthing Rooms			2.0	1.0
Intensive Care			2.0	1.0	No recirculation within room.
Morgues			1.5	3.0	See Note 5.
Nurseries			2.0	1.0
Operating Rooms			2.0	1.0	No recirculation within room.
Patient Rooms		4	0	0	May exhaust through toilet room.
	4		0.3	0.3
Physiotherapy		4	0	0
	4		0.6	0.3
Recovery Rooms			1.0	1.0	No recirculation within room.
Sterilizing Equipment Rooms			1.6	1.6	No recirculation within room. See Note 5.
Treatment Rooms			0.6	0.3
X-Ray operator's rooms			0.6	0.3
Hotels, Motels and Dormitories
Banquet Halls/Assembly Pre-function			2.0	1.5
Hotels (Lobby)		4	0	0
	4		1.0	NR
Sleeping Rooms		4	0	0	May exhaust through toilet room.
	4		0.3	0.3
Foyers except the above			0	0
Sleeping Rooms (Dormitories)		4	NV	NV	See Chapter 13-172 Light and Ventilation.
Offices
Lunch Rooms - no cooking		4	0	0
	4		1.5	1.5
Offices and computer rooms		4	0	0
	4		0.6	0.3
Entrance lobby		4	0	0
	4		1.0	NR
Private Dwellings (Single and Multiple)
Living Quarters			NV	NV	See Chapter 13-172.
Living Quarters (Kitchen)		4	0	0	See Notes 1 and 4.
	4		0	1.5
Toilet Rooms (residential)		4	0	0	See Notes 2 and 4.
	4		0	1.5
Residential Dryers	NA	NA	0		See Notes 3 and 4.
Multi-Purpose Rooms	NR	NR	0.3	0.3 or R.O.
Public Spaces
Corridors			NR	NR
Dressing Rooms		4	0	0
	4		1.0	1.2
Janitor's Closet			0	2.0	See Note 5.
Locker Rooms		4	0	0	See Note 5.
	4		0.3	1.2
Pedestrian Passageways (below grade)			1.5	1.0
Pedestrian Passageways (above grade)		4	0	0
	4		1.5	1.0
Shower Rooms		4	0	0
Smoking Rooms		4	0	0	See Note 5.
	4		1.0	1.5
Toilet Rooms		4	0	0	See Note 5.
	4		0	2.0
Waiting Rooms		4	0	0
	4		1.0	1.0
Retail Stores
Malls		4	0	0
	4		1.0	1.0
Retail Stores		4	0	0
	4		1.0	1.0
Specialty Shops
Auto and vehicle washing (attended)			1.0	1.0	See Note 5.
Auto repair shops			1.0	1.0	See Note 5.
Photo materials and engraving		4	0	0	See 18-28-403.3.3.
	4		1.0	1.0
Beauty Parlors/Barber Shops		4	0	0	See Note 5.
	4		1.2	1.2
Theaters
Auditoriums (including stage)		4	0	0
	4		2.0	1.5
Concert Halls		4	0	0
	4		2.0	1.5
Foyers in Theaters			1.0	1.0
	4		2.0	1.0
Studios – motion picture, radio, TV			1.5	0.75	Or RO.
Theatrical Community Centers		4	0	0
	4		1.5	0.75
Workrooms
Workshops not otherwise classified		4	0	0	See 18-28-403.3.3.
	4		1.2	1.2
Wood working shop	0	4	0	0	See Article 5 - Makeup air is required when direct exhaust > 5, 000 CFM.
	4		1.2	1.2
Spray Finishing		4			See Article 5 - Makeup air is required when direct exhaust > 5, 000 CFM.
	4		1.5	1.2
Spray Booths		4			See Article 5 - Makeup air is required when direct exhaust > 5, 000 CFM.
	4		1.5	1.5
Bank Vaults Attended			0.6	0.3
Battery Charging - Dry Cell Batteries			NR	0.5	3 or more batteries.
- Other Batteries			NR	1.0
Sports and Amusement
Bowling Alleys (seating areas)		4	0	0
	4		1.7	0.85
Ball Rooms		4	0	0
	4		2.0	1.5
Cabarets		4	0	0
	4		2.0	1.5
Dance Halls/Discos		4	0	0
	4		2.0	1.5
Game Rooms/Arcades		4	0	0
	4		1.6	1.6
Gymnasiums		4	0	0	Or RO.
	4		2.0	1.5
Natatoriums (deck and seating)		4	0	0
	4		2.0	1.5
Recreation Rooms		4	0	0
	4		2.0	1.5
Skating Rinks, Ice Arenas		4	0	0
	4		1.5	1.5
Skating Rinks, Roller		4	0	0
	4		2.0	1.5
Storage
Storage inactive			0	0
Storage active			0.5	0.5
Storage cold (no permanent occupancy)			0	0
Vault, Storage			NR	NR
Laboratories
Laboratories		5	0	0	See 18-28-403.3.3.
	5		1.2	1.2
Animal Rooms			0	1.5
Religious
Auditoriums for worship/Chapels		4	0	0	Or RO.
	4		1.5	0.75
Special Use
Convention Halls		4	0	0
	4		2.0	1.5
Council Chambers		4	0	0
	4		2.0	1.5
Court Rooms		4	0	0
	4		2.0	1.5
Exhibition Rooms			1.5	0.75	Or RO.
Fraternal Rooms			1.5	0.75	Or RO.
Lodge Halls			1.5	0.75	Or RO.
Museums			0.6	NR	Or RO.
Garages/Parking Structures					See Miscellaneous
Garages, 6 or more cars			0.75	1.0
			RO	1.0
Garages, less than 6 cars			RO	RO	1.0 sf of opening per car.
Garages in or attached to Hospitals			0.75	1.0	Exhaust duct, 14 gauge.
			RO	1.0

 

Note 1. When a common exhaust system serves multiple kitchens, a minimum 75% of the ordinance air shall be used in sizing of central fan and ductwork, provided automatic controls are installed to shut off exhaust from individual kitchens when not in use.

Note 2. When a common exhaust serves multiple toilet rooms, a minimum 50% of the ordinance air shall be used in sizing of central fan and ductwork, provided automatic controls are installed to shut off exhaust from individual toilet rooms when not in use.

Note 3. Provide a minimum room exhaust of 110 CFM per electric dryer.

Note 4. Corridor make-up air system for residential building over 55 feet in height shall be sized to equal the total of toilet, kitchen and dryer air exhaust requirements.

Note 5. There shall be no recirculation permitted from these spaces.

(Amend Coun. J. 9-14-16, p. 31143, § 8; Amend Coun. J. 3-29-17, p. 45477, § 12)