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Ventilation of rooms
Ventilation of rooms
The correct ventilation of a room is important if condensation problems are to be avoided. The guide below gives the minimum requirements for each room type.
| Room(1) |
Rapid ventilation opening(s) (minimum free area) |
Background ventilation opening(s)(2) (minimum free area) |
Mechanical extract ventilation(3)(4) (nominal airflow rates) |
| Habitable room |
1/20th of floor area |
8000 mm2 |
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| Kitchen(5) |
1/20th of floor area |
4000 mm2 |
30 litres/second adjacent
to a hob(6) or 60 litres/
second elsewhere |
| Utility room |
1/20th of floor area |
4000 mm2 |
30 litres/second |
| Bathroom (with or without WC) |
1/20th of floor area |
4000 mm2 |
15 litres/second |
Sanitary accommodation
(separate from bathroom) |
1/20th of floor area(7) |
4000 mm2 |
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- Notes to Table
Where a room serves a combined function such as a kitchen-diner, the individual provisions for rapid, background
and mechanical extract ventilation need not be duplicated provided that the greater or greatest provision for the
individual functions in Table 2.1 is made.
- As an alternative to the background ventilation provisions listed in Table 2.1, background ventilation openings
equivalent to an average of 6000 mm2 per room may be provided but no room shall have a background ventilation
opening of less than 4000 mm2.
- ) As an alternative to mechanical extract ventilation, passive stack ventilation may be provided. Where passive stack
ventilation is provided it shall be designed and constructed in accordance with BRE Information Paper 13/94 or a
valid BBA Certificate.
- Mechanical extract ventilation shall not be provided in a room where there is an open-flued solid fuel burning
appliance (see paragraph 1.4). Mechanical extract ventilation (or passive stack ventilation) need not be provided in a
room with an open-flued appliance which has a flue having a free area at least equivalent to a 125 mm diameter duct
and the appliance’s combustion air inlet and dilution air inlet are permanently open when the appliance is not in use.
- This provision is for a domestic size kitchen where the appliances and usage are of a domestic nature. Guidance on
the ventilation required for commercial kitchens is given in CIBSE Guide B, Tables B2.3 and B2.11.
- Adjacent to a hob means either –
(a) incorporated within a cooker hood located over the hob; or
(b) located near the ceiling within 300 mm of the centreline of the space for the hob.
- As an alternative, mechanical extract ventilation at 6 litres/second may be provided.
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Please check with your local building control department before using information contained in this page to ensure that they comply with your local building codes.
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Thinking of home improvments:
Call us on the number below or email us at info@carryduffdesigns.co.uk
We undertake projects within and around the following areas: All of Belfast, Newtownards, Bangor, Ards Peninsula, Comber, Ballynahinch, Downpatrick, Lisburn, Banbridge, Craigavon, Portadown, Newtownabbey and Carrickfergus.
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