18-28-403.3 Ventilation requirements.

   See Table 18-28-403.3, Ventilating Requirements.

Table 18-28-403.3
Ventilating Requirements*

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* 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	See Chapter 14B-12; may exhaust through toilet room.
	4		0.3	0.3
Toilet Rooms / Bathrooms – Private					See Note 6.
Foyers except the above			0	0
Sleeping Rooms (Dormitories)		4	NV	NV	See Chapter 14B-12.
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 14B-12.
Living Quarters (Kitchen)		4	0	0	See Note 7.
	4		0	1.5
Toilet Rooms / Bathrooms – Private					See Note 6.
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
Private 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. [Reserved.]

Note 2. [Reserved.]

Note 3. [Reserved.]

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.

Note 6. For each private toilet room or bathroom: 20 CFM when the exhaust system is designed to operate continuously when the associated living quarters are occupied; 50 CFM when the exhaust system is designed to operate intermittently. For intermittent operation, either an automatic control or ready access to a manual control shall be provided within the room.

Note 7. For each residential kitchen: 50 CFM when the kitchen is enclosed and the exhaust system is designed to operate continuously when the associated living quarters are occupied; 100 CFM vented range hood or 300 CFM mechanical exhaust (including downdraft) when the kitchen is unenclosed or the exhaust system is designed to operate intermittently. For intermittent operation, either an automatic control or ready access to a manual control shall be provided within the room.

(Amend Coun. J. 9-14-16, p. 31143, § 8; Amend Coun. J. 3-29-17, p. 45477, § 12; Amend Coun. J. 4-10-19, p. 100029, Art. XII, § 5; Amend Coun. J. 9-14-21, p. 35949, Art. IV, § 4; Amend Coun. J. 9-21-22, p. 52080, Art. II, § 8)

18-28-403.3.1.

   If a room or department in any factory is to process, brew, or mill food or beverages, and a large floor area is occupied by permanently installed, closed tanks, vats or food processing equipment (thus reducing occupiable floor space), the minimum ventilating requirements specified in Table 18-28-403.3 shall be adjusted and determined to conform to the following requirements.

   1.   Rooms in which the total area of the ventilating opening is 4 percent or more than the "employees" net work floor area shall conform to the requirements for natural ventilation.

   2.   Rooms which have no ventilation opening or in which the total area of the ventilation opening is less than four percent of the "employees" net work floor area shall provide supply and exhaust of 1.2 cfm per square foot of net work floor area.

18-28-403.3.2 Refrigerated rooms.

   If a refrigerated room or area is not used for human occupancy, no ventilation requirements shall apply. If a refrigerated room or area is used for human occupancy, supply and exhaust of 0.6 cfm per square foot shall be provided in the refrigerated room or area.

   Exceptions:

      1.   The table of minimum ventilation requirements does not apply to any mechanically refrigerated room or area necessarily used and required to age food or beverages.

      2.   The table of minimum ventilation requirements does not apply to the storage and preservation of meat, food and beverage products.

18-28-403.3.3 Dangerous or noxious contaminants.

   If the nature of any work being done in a room or area is of such a character that dangerous or noxious dust, fumes, mists, gases, odors or other contaminants harmful to workers or occupants may get discharged, the ventilating requirements found in Table 18-28-403.3 shall be supplemented by using a local mechanical exhaust to remove the emission at its source, to prevent the escape of contaminants to the occupied space, and to discharge the mechanical exhaust to the outside atmosphere. Such mechanical exhaust shall be equipped with suitable means for the collection and removal of the contaminates. See Article 5, Exhaust Systems.

18-28-403.3.4 Total air supply.

   The total air supplied from the outside atmosphere shall be equivalent to, or greater than the total air volume removed by the general and local exhaust systems. See also Article 5, Exhaust Systems.

18-28-403.3.5 Air filter requirements.

   Ventilating systems that serve anaesthetizing rooms, intensive care rooms, patient rooms, operating rooms, nurseries, delivery rooms and similar health care rooms shall have at least 2 banks of air filters and shall meet the following requirements:

   1.   Filter Bank No. 1 shall be installed in the suction side of the supply fan and shall have a minimum air cleaning efficiency rating of 30 percent.

   2.   Filter Bank No. 2 shall be installed on the pressure side of the supply fan and shall have a minimum air cleaning efficiency rating of 90 percent.

   3.   All air cleaning efficiencies shall be based on the National Bureau of Standards Dust Spot Test Method and Atmospheric Dust.

18-28-403.3.6 Pedestrian passage way.

   The velocity of air movement due to ventilation at any cross section of a pedestrian passage way shall not exceed 60 feet per minute.