BS 5440-1:2000 Installation and maintenance of flues and ventilation for gas appliances of rated heat input not exceeding 70 kW net (1st, 2nd and 3rd family gases) - Specification for installation and maintenance of flues
1 Equipment
This Part of BS 5440 specifies the selection, design, installation and maintenance requirements for flue systems which form part of a new or replacement appliance installation for domestic or commercial purposes. It also specifies requirements for connecting gas appliances to existing flues. It specifies natural and fanned draught flues for appliances which carry the CE mark, utilize 1st, 2nd or 3rd family gases and have rated heat inputs based on net (lower) Calorific Value (CV) not exceeding 70 kW. It may also be used for installations of appliances which do not carry the CE mark, e.g. used appliances, where appropriate, providing the appliance manufacturer's instructions are available. In such circumstances, the installer should ensure that the appliance is safe in construction and condition, and can be used without constituting a danger.
The rating of 70 kW applies to an individual appliance connected to a flue system and, in the case of more than one appliance in the same room connected to a flue system, to the sum of the ratings. For shared flues, e.g. Se-ducts or U-ducts, the rating applies to the individual appliance rating per dwelling.
This standard deals with the complete flue equipment from the appliance connection, to the discharge point into outside air. It also covers flues that were intended originally for appliances burning other fuels but which are subsequently used for gas appliances.
This standard does not specify flue systems for decorative fuel effect fires which are specified in BS 5871-3.
This standard specifies residential park homes but not leisure accommodation vehicles. The latter are covered by prEN 1949 or IGE document UP/8 [7].
NOTE 1 The range of appliances has been amended from 60 kW based on gross CV in the previous version of this standard to 70 kW based on net CV in order to achieve compatibility with the gas appliance product standards. For information on flues for appliances having rated inputs exceeding 70 kW, reference should be made to BS 6644. Although the present scope of BS 6644 includes the range 60 kW gross to 70 kW net, this part of BS 5440 should be used for flues in that range since it comprises the most up-to-date specification.
NOTE 2 This standard does not cover gas-fired incinerators. Such appliances require special considerations because of the high flue gas temperatures they generate. For specific information on incinerators see BS 3813-1.
NOTE 3 The installer should check the data given with an appliance to establish the basis on which the heat input is given. The data in this standard refers to heat input expressed in terms of net calorific values (CV) with conversion given for natural gas gross CV quoted in brackets where appropriate.
The ratio of gross : net heat input is approximately 1.11: 1 for natural gas, 1.09 : 1 for propane and 1.08: 1 for butane. For example, convert 9 kW input based on gross CV for natural gas to the equivalent net CV input as follows:
Net input = 9.0/1.11 = 8.1 kW
2 Competency
It is essential that persons carrying out the installation of any gas appliance and its flue be competent to do so, and, in the case of any work that is subject to the current Gas Safety (Installation and Use) Regulations [1], it is essential to comply with these regulations.
It is essential that persons who design the flue system should have the knowledge and understanding of the standards and regulations that apply to ensure that the completed plans will produce a safe and satisfactory installation.
COMMENTARY AND RECOMMENDATIONS ON 1.2.
At the time of publication, the body with HSE approval to operate and maintain a register of businesses who are "members of a class of persons" is the Council for Registered Gas Installers (CORGI). Thus it is essential that all business or self employed gas fitters should be registered with CORGI.
Guidance on the individual competency required for gas work is given in the Health and Safety Commission's Approved Code Of
BS 5440-1:2000 history
2023BS 5440-1:2023 Chimneys, flue pipes and ventilation for gas appliances of rated input not exceeding 70 kW net (1st, 2nd and 3rd family gases) - Design, installation, commissioning and maintenance of chimneys. Specification
2008BS 5440-1:2008 Flueing and ventilation for gas appliances of rated input not exceeding 70 kW net (1st, 2nd and 3rd family gases) – Part 1: Specification for installation of gas appliances to chimneys and for maintenance of chimneys
2000BS 5440-1:2000 Installation and maintenance of flues and ventilation for gas appliances of rated heat input not exceeding 70 kW net (1st, 2nd and 3rd family gases) - Specification for installation and maintenance of flues