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VENTILATION OF BUILDINGS OTHER THAN GARAGES
(K2.1) The requirements of K2.1 will be met -
a. for a room in a building other than a dwelling, by the provision of a ventilator with an opening area of at least 1/30th of the floor area of the room it serves; and where the area of the room is
i. not more than 10 square metres, a trickle ventilator with an opening area of at least 4000 mm2; or
ii. more than 10 square metres, a trickle ventilator with an opening area of at least 400 mm2 for each square metre of room area; or
b. for any building with natural ventilation by -
i. compliance with Section 3 of BS5925: 1991 (1995); or
ii. CIBSE Guide A: 1986, Design data, Section A4, Air infiltration and natural ventilation; or
c. for any building with mechanical ventilation (there are additional provisions in Part E for mechanical ventilation systems), by -
i. compliance with BS5720: 1979; or
ii. CIBSE Guide B: 1986, Section B2; or
d. for dwellings only, by -
i. compliance with the requirements of BRE Digest 398; or
ii. the table to this specification -
Table to (K2.1): Ventilation of a dwelling
|
Space |
Minimum Ventilation Requirements |
Trickle Ventilation (minimum) [Note 1] |
|
Apartment |
a ventilator with an opening area of 1/30th of the floor area it serves. |
8000 mm2 |
|
Kitchen |
either - a. mechanical extraction capable of 30 litres/sec (intermittent) above a hob [Note 2]; b. mechanical extraction capable of 60 litres/sec (intermittent) if elsewhere [Note 2]; or c. a passive stack ventilation system [Notes 3 & 4]. |
4000 mm2 |
|
Utility room |
either - a. mechanical extraction capable of 30 litres/sec (intermittent) [Note 2]; or b. a passive stack ventilation system [Notes 3 & 4]. |
4000 mm2 |
|
Bathroom or shower-room (with or without a WC). |
either - a. mechanical extraction capable of 15 litres/sec (intermittent); or b. a passive stack ventilation system [Note 3]. |
4000 mm2 |
|
Watercloset compartment |
either - a. a ventilator with an opening area of 1/30th of the floor area it serves; or b. mechanical extraction capable of 3 air changes per hour. |
4000 mm2 |
Notes:
1. The overall provision of trickle ventilation in a dwelling may be provided at an average of 6000 mm2 per room, with a minimum provision of 4000 mm2 in each apartment.
2. Refer to Part F where an extract fan is fitted in a building containing an open-flued combustion appliance.
3. Refer to Part D where a passive stack ventilation system is installed in a building of purpose sub-group 1A.
4. The flue of an open-flued combustion appliance may serve as a passive stack ventilation system provided that either -
a. the appliance is a solid fuel appliance and is the primary source of heating, cooking or hot water production; or
b. the flue has an unobstructed area equivalent to a 125mm diameter duct and the appliance’s combustion air inlet and dilution air inlet are permanently open, i.e. there is a path with no control dampers which could block the flow, or the ventilation path can be left open when the appliance is not in use.
(K3.1) The requirements of K3.1 will be met by a parking garage constructed -
a. in accordance with Section B2 of the CIBSE Guide: 1986, -
i. to give carbon monoxide concentrations of not more than 50 parts per million averaged over an eight hour period; and
ii. to restrict peak concentrations of carbon monoxide at areas of traffic concentration such as ramps and exits to not more than 100 parts per million for periods not exceeding 15 minutes;
b. in accordance with Section 4 of the Association for Petroleum and Explosive Administration’s "Code of practice for ground floor, multi-storey and underground car parks", and Section B2 of the CIBSE Guide B: 1986;
c. where the garage is naturally ventilated, by providing openings in the walls on every storey of at least 1/20th of the floor area of that storey with at least half of such area in opposite walls;
d. where the garage is mechanically ventilated, by providing a system capable of at least 6 air changes per hour and at least 10 air changes per hour where traffic concentrations occur; or
e. where there is a combined natural/mechanical ventilation system, by providing -
i. openings in the walls on every storey of at least 1/40th of the floor area of that storey with at least half of such area in opposite walls; and
ii. a mechanical system capable of at least 3 air changes per hour.
(K3.2) The requirements of K3.2 will be met -
a. where the garage is naturally ventilated, by providing at least 2 permanent ventilators, each with an open area of at least 1/3000th of the floor area they serve, positioned to encourage through ventilation with one of the permanent ventilators being not more than 600mm above floor level; or
b. where the garage is mechanically ventilated, by providing a ventilation system -
i. capable of continuous operation, designed to provide at least 2 air changes per hour;
ii. independent of any other ventilation system; and
iii. constructed so that two-thirds of the exhaust air is extracted from outlets not more than 600mm above floor level.
(K4.1) The requirements of K4.1b will be met where the trickle ventilator fitted in the bedroom complies with the table to (K2.1).
(K4.3) The requirements of K4.3 will be met by a passive stack ventilation system constructed and installed fully in accordance with Information Paper BRE IP 13/94.
(K4.9) The requirements of K4.9 will be met where the inlet to, and outlet from, the mechanical ventilation system are installed in accordance with Clause 2.3.3 of BS5720: 1979.
(K4.10) The requirements of K4.10 will be met where the ventilation system is constructed in accordance with the requirements of paragraphs 70 to 84 of "The control of legionellosis including legionnaires’ disease"
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