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Installation and maintenance of flues and ventilation for gas appliances of rated input not exceeding 70 kW net (1st, 2nd and 3rd family gases) – Part 2: Specification for installation and maintenance of ventilation for gas appliances

Executive summary

Ventilation requirements for new or replacement gas appliances for domestic or non-domestic purposes.


This British Standard, a part of the BS 5440 series, specifies the ventilation requirements for new or replacement gas appliances for domestic or non-domestic purposes utilizing 1st, 2nd or 3rd family gases which carry the CE mark and with a rated heat input not exceeding 70 kW based on net CV (net calorific value).

This standard may also be used for installations of appliances which are not required under the Gas Appliances (Safety) Regulations:1995 to carry the CE mark, e.g. used appliances.

This standard does not cover:

a) LPG installations and installations with all gases;

b) any gas installations in caravans, holiday homes or residential park;

c) decorative fuel effect gas appliances.

History and related standards

This British Standard is a revision of BS 5440-2:1989, which is withdrawn.

It includes the following cross references:

BS 1179-6, BS 7624, BS EN 449:1997.

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