NCC 2016 Volume Two
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Part 3.8.5 Ventilation

Part 3.8.5 Ventilation

Appropriate Performance Requirements

Appropriate :

Where an alternative ventilation system is proposed as a Performance Solution to that described in Part 3.8.5, that proposal must comply with—

  1. ; and
  2. the relevant Performance Requirements determined in accordance with 1.0.7.

Explanatory information

Explanatory information:

The requirements of this Part are to be read in conjunction with the air movement requirements in Part 3.12.4. However, it should be noted that Part 3.12.4 does not apply in all States and Territories.

Acceptable construction manual

3.8.5.0

(a)

Except for an exhaust fan from a sanitary compartment, laundry or bathroom, Performance RequirementP2.4.5 is satisfied for a mechanical ventilation system if it is installed in accordance with AS 1668.2.

(b)

An exhaust fan from a sanitary compartment, laundry or bathroom must comply with the acceptable construction practice.

Acceptable construction practice

3.8.5.1 Application

Compliance with this acceptable construction practice satisfies Performance Requirement for ventilation.

3.8.5.2 Ventilation requirements

Ventilation must be provided to a habitable room, sanitary compartment, bathroom, shower room, laundry and any other room occupied by a person for any purpose by any of the following means:

(a)

Openings, windows, doors or other devices which can be opened—

(i)

with a ventilating area not less than 5% of the floor area of the room required to be ventilated; and

(ii)

open to—

(A)

a suitably sized court, or space open to the sky; or

(B)

an open verandah, carport, or the like; or

(C)

an adjoining room in accordance with (b).

Explanatory information

Explanatory information:

The ventilating area of a window is measured as the size of the openable sash of the window. This is the case regardless of the type of window, i.e. whether it is an awning, casement or sliding window and irrespective of the restrictions on the openable sash.

(b)

Natural ventilation to a room may come through a window, opening, door or other device from an adjoining room (including an enclosed verandah) if—

(i)

the room to be ventilated or the adjoining room is not a sanitary compartment; and

(ii)

the window, opening, door or other device has a ventilating area of not less than 5% of the floor area of the room to be ventilated; and

(iii)

the adjoining room has a window, opening, door or other device with a ventilating area of not less than 5% of the combined floor areas of both rooms; and

(iv)

the ventilating areas specified may be reduced as appropriate if direct natural ventilation is provided from another source.

(See Figure 3.8.5.1)

Explanatory information

Explanatory information:

permits a room's required ventilation to be "borrowed" from an adjoining room, i.e. an adjoining room's ventilation can be used to help make up the total amount of ventilation required.

The use of borrowed ventilation is acceptable if the provisions of 3.8.5.2(b) are applied to the subject room and to the total area of each relevant room.

Figure 3.8.5.1

METHOD OF DETERMINING AREAS OF OPENINGS FOR BORROWED VENTILATION

v2_Fig3851_2005.svg
(c)

An exhaust fan or other means of mechanical ventilation may be used to ventilate a sanitary compartment, laundry or bathroom, or where mechanical ventilation is provided in accordance with 3.8.5.3(b), provided contaminated air exhausts—

(i)

directly to outside the building by way of ducts; or

(ii)

into a roof space that—

(A)

is adequately ventilated by open eaves, and/or roof vents; or

(B)

is covered by roof tiles without sarking or similar materials which would prevent venting through gaps between the tiles.

Explanatory information

Explanatory information:

Except where mechanical ventilation is provided in accordance with 3.8.5.3(b), 3.8.5.2(c) only applies where an exhaust fan or other means of mechanical ventilation is provided as the sole means of ventilation for a sanitary compartment, laundry or bathroom.

3.8.5.3 Location of sanitary compartments

Sanitary compartments must not open directly into a kitchen or pantry unless—

(a)

access is by an airlock, hallway or other room, (see Figure 3.8.5.2); or

(b)

the sanitary compartment is provided with an exhaust fan or other means of mechanical exhaust ventilation.

Figure 3.8.5.2

ACCEPTABLE LOCATION OF NON MECHANICALLY VENTILATED SANITARY COMPARTMENT

v2_Fig3852_2005.svg