AS1668.2 Exhaust Air Requirements

Enclosure type	Quantity	Unit	Comments
Automotive vehicle			See AS 2676.2
Battery charging		L/s.m2 floor
Change room	5	L/s.m2 floor	May include lockers
Document copying process that emits objectionable effluent	5	L/s.m2 floor	Does not include office based printing
Drycleaning (solvent)	20	L/s.m2 floor
Garages			See Section 4
Garbage room and service compartment	5	L/s.m2 floor	100 L/s min.
		L/s.m2 floor
Gas meter	5	L/s.m2 floor
Grease arrester	5	L/s.m2 floor	100 L/s min.
Health care
Autopsy	12	Air changes per hour
Dirty utility	10	Air changes per hour
Infectious isolation	6	Air changes per hour
Recovery	10	Air changes per hour
Post Anaesthetic Care Unit (PACU) (Recovery Stage 1)	10	Air changes per hour
Sterilizing	20	L/s.m2 floor	May be 5 L/s.m2 of floor when local exhaust provided over sterilizers (see Clause 3.2).
Kitchen commercial	5	L/s.m2 floor
Laundry commercial	15	L/s.m2 floor
Laundry residential			Rate is independent of enclosure size. Operation of the system may be intermittent Where a laundry is located within a bathroom, the greater quantity of either space shall apply
No dryer	20	L/s.room
Condensing dryer	20	L/s.room
Non-condensing dryer	40	L/s.room	The greater of 110% of the dryer airflow (where this is known) or 40 L/s room.
Sanitary compartment			Sanitary compartments subject to high level of use (e.g. airports, entertainment venues, and similar venues may require an increased ventilation rate) Where privacy locks or airlocks are included, provision should be made for their ventilation at 5 L/s.m2 of floor area (e.g. via make-up air) (Handbasins are not considered as a ‘listed fixture’)
Bath	10 or 25	L/s.m2 floor or L/s per listed fixture
Shower	10 or 25	L/s.m2 floor or L/s per listed fixture
Urinal	10 or 25	L/s.m2 floor or L/s per listed fixture	The greater of the two values shall be taken. Each 0.6 m length of urinal shall be considered to be equivalent to one fitting. Where the number of fixtures is not known, it may be determined at a rate of 0.4 fixtures per m2 of floor area.
Water closet	10 or 25	L/s.m2 floor or L/s per listed fixture
Bathroom/Toilet	25	L/s.room	May include bath, shower and water closet in one compartment. Rate is independent of room size (see Note 2) Higher air quantities may be required for vapour control or removal (Handbasins are not considered as a ‘listed fixture’) Operation of the system may be intermittent
Private dwellings and attached to bedroom of hotels, motels, resorts, private hospital rooms and the like		L/s.m2 floor
Sewage ejection		L/s	Minimum
Swimming pools			For areas operating above 30°C, or with agitated water surfaces, higher ventilation rates may be applicable
Spas and hydrotherapy pools	15	L/s.m2 floor
Pool and deck areas	10	L/s.m2	For the purposes of determining pool area, this is equal to 115% pool surface area (to accommodate splash area) Higher values may also be required for humidity control
Plant room/storage room	5	L/s.m2 floor	Enclosures used for storage of equipment, plant or materials likely to contaminate the air will need special consideration (see Appendix O).
Lifts			Lift car and motor room ventilation, see AS 1735.1
Refrigeration			See AS/NZS 1677.2

AS1668.2 Exhaust Air Requirements

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