Room Ventilation Building Codes & Rules
- Learn NCC ventilation rules: 5% natural vent, 25 L/s for bathrooms, 40 L/s for kitchens, shut‑off delays, and ceiling‑height requirements.
NCC 2022 HP, 10.6.3
Sanitary Compartment VentilationNCC 2022 HP, 10.6.3
- Opening location must not be facing a Pantry or Kitchen, unless
- Provided with an Exhaust fan or other exhaust ventilation system aside from Window
- Entry is by hallway, airlock or another room
NCC 2022 HP, 10.3.1 (1) (f)
NCC 2022 HP, 10.3.1 (1) (d)
NCC 2022 HP, 10.3.1 (1) (a)
NCC 2022 HP, 10.3.1 (1) (b)
Habitable Room
NCC 2022 HP, 10.6.2 (c)
NCC 2022 HP, 10.8.2 (1)
NCC 2022 HP, 10.8.2 (5)
NCC 2022 HP, 10.8.2 (4)
NCC 2022 HP, 10.8.2 (3)
NCC 2022 Vol 1, F6D6
NCC 2022 Vol 1, F6P4
Mechanical Ventilation System
- Use of Exhaust Fan & other Mechanical Ventilation to Non-habitable areas suchNCC 2022 HP, 10.6.2 (c)
- Sanitary compartment,
- Laundry,
- Kitchen, or
- Bathroom
- Exhaust Flow rateNCC 2022 HP, 10.8.2 (1)
- ≥ 40 L/s for Laundry or Kitchen
- ≥ 25 L/s for Sanitary Areas
- Make-up air for rooms with an exhaust systemNCC 2022 HP, 10.8.2 (5)
- ≥14,000 mm² adjacent room area openings
- AS 1668.2 compliant
- Bathroom & sanitary compartment dedicated exhaust system mustNCC 2022 HP, 10.8.2 (4)
- 10 minute timer operates after light's off
- Connects to room's Light Switch
- Venting clothes dryer must vent outdoors through Shaft or DuctNCC 2022 HP, 10.8.2 (3)
- Mechanical air-handling system mustNCC 2022 Vol 1, F6D6
- Control offensive odors
- Prevent growth of infections, poisons, & harmful microorganisms
- Compliant with AS 1668.2 & AS/NZS 3666.1NCC 2022 Vol 1, F6P4
Sloped Ceiling Room Heights
- Any part with a ceiling height of ≤ 1.5m is excluded when determining the floor area of a room or space[1]
Sloped Ceiling Room Heights
NCC 2022 V1
Building Classes 1 & 10
NCC 2022 HP 10.3.1 (e)(i)(B), HP 10.3.1 (e)(i)(A), HP 10.3.1 (e)(ii)
2022
NCC 2022 HP, 10.3.1 (1) (e) (i) (B)
NCC 2022 HP, 10.3.1 (1) (e) (ii)
NCC 2022 HP, 10.3.1 (1) (e) (i) (A)
- Habitable Sloped RoomsNCC 2022 HP, 10.3.1 (1) (e) (i) (B)
- ≥ 2.4m room height for ≥ 2/3 of the room floor area
- Non-habitable Sloped RoomsNCC 2022 HP, 10.3.1 (1) (e) (ii)
- ≥ 2.1m room height for ≥ 2/3 of the room floor area
- Attic RoomsNCC 2022 HP, 10.3.1 (1) (e) (i) (A)
- ≥ 2.2m room height for ≥ 2/3 of the room floor area
NCC 2022 HP, 10.3.1 (2)
- Any part with a ceiling height of ≤ 1.5m is excluded when determining the floor area of a room or spaceNCC 2022 HP, 10.3.1 (2)
NCC 2022 HP, 10.6.2 (a) (i)
NCC 2022 Vol 1, F6P3
NCC 2022 Vol 1, F6P5
NCC 2022 HP, 10.6.2 (b) (iv)
NCC 2022 HP, 10.6.2 (b) (i)
NCC 2022 Vol 1, F6D8 (b)
NCC 2022 HP, 10.6.2 (a) (ii)
Informative
NCC 2022 Vol 1, F6D8 (a)
NCC 2022 HP, 10.6.2 (b)
NCC 2022 Vol 1, F6D8 (c)
NCC 2022 Vol 1, F6D8 (a) (i)
Habitable Rooms Ventilation
- Windows, Doors, Openings & Other openable devices
- ≥ 5% of Room Floor AreaNCC 2022 HP, 10.6.2 (a) (i)
- To openable spaces suchNCC 2022 Vol 1, F6P3
- Suitable sized Courts,
- Patio
- Verandah,
- Carport, or the like
- Require natural air ventilation to maintain proper air qualityNCC 2022 Vol 1, F6P5
- Safely dispose contaminated air to prevent disruptions or risks to adjacent propertiesNCC 2022 HP, 10.6.2 (b) (iv)
Borrowed Ventilation from Adjoining Room
- Allows a room gets fresh air from another nearby roomNCC 2022 HP, 10.6.2 (b) (i)
- For Class 2, 3, 4 openingsNCC 2022 Vol 1, F6D8 (b)NCC 2022 HP, 10.6.2 (a) (ii)
- Between the two rooms: ≥ 5% of the floor area of the room needing ventilation
- To outside in the adjoining room: ≥ 5% of combined rooms floor area
- For Class 5 to 9, except Class 8 substations openingsInformative
- Between the two rooms: ≥ 10% of the floor area of the room needing ventilation with ≤ 3.6m opening height FFL
- To outside in the adjoining room: ≥ 10% of combined rooms floor area
- Reduces required area if direct natural ventilation is provided from alternate sourceNCC 2022 Vol 1, F6D8 (a)NCC 2022 HP, 10.6.2 (b)
- Adjacent room is Not a Sanitary CompartmentNCC 2022 Vol 1, F6D8 (c)NCC 2022 Vol 1, F6D8 (a) (i)
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