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BS 5871-4:2007

BS 5871-4:2007

$128.58

Specification for the installation and maintenance of gas fires, convector heaters, fire/back boilers and decorative fuel effect gas appliances – Independent gas-fired flueless fires, convector heaters and heating stoves of nominal heat input not exceeding 6 kW (2nd and 3rd family gases)

Published By Publication Date Number of Pages
BSI 2007 38
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This part of BS 5871 specifies installation and maintenance requirements for independent gas-fired flueless fires, convector heaters and heating stoves of nominal heat input not exceeding 6 kW burning 2nd and 3rd family gases for the purpose of heating rooms or internal spaces in domestic (see note 3) or commercial premises. Specifically, it covers:

  1. fixed appliances that satisfy all the requirements of BS EN 14829;

  2. fixed appliances that satisfy the combustion requirements of BS EN 14829;

  3. convector heaters of nominal heat input not exceeding 4.2 kW in the form of greenhouse heaters in respect of single appliance installations.

    NOTE 1 Appliances a) and b) are only intended as a secondary heat source (see Commentary and Recommendations on 4.2).

The heat input and ventilation, fixing and gas supply for convector heaters in the form of greenhouse heaters are specified in 8.4, 9.4 and Clause 11, respectively.

This part of BS 5871 covers the selection of a suitable appliance, room sizing and ventilation requirements and other measures necessary to ensure a safe installation.

NOTE 2 Heat inputs in this document are based on net calorific value. [See also Commentary and Recommendations on Clause 5, item b).]

NOTE 3 As well as normally constructed dwellings, domestic premises include any permanently sited caravans, holiday homes and residential park homes. (See IGE/UP/8 [9].)

NOTE 4 Convector heaters in the form of greenhouse heaters are available in two forms, those which are freestanding and those which are intended to be fixed to a wall or floor.

This standard is not applicable to:

  1. mobile and portable appliances conforming to BS EN 449;

  2. appliances in motor caravans and touring caravans;

  3. appliances in boats;

  4. installations in agricultural premises; or

  5. installations in transportable accommodation units.

    NOTE 5 For the maintenance of existing installations of 3rd family flueless appliances in boats, see PD 5482-3.

PDF Catalog

PDF Pages PDF Title
3 Contents
1 Scope 1
2 Normative references 2
3 Terms and definitions 3
4 Exchange of information and planning 4
5 Appliances 7
6 Materials and components 8
7 Location 10
8 Appliance sizing and ventilation 10
9 Appliance fixing 13
10 Fire precautions 15
11 Gas supply 19
12 Electricity supplies and wiring 21
13 Commissioning 21
14 Instructions and use of fireguards 22
15 Advice to be given to the user 22
Annexes
Annex A (informative) Guidance on ventilation requirements for flueless gas fires 25
Bibliography 29
List of figures
Figure 1 – Examples of flueless appliances 9
Figure 2 – General layout of a raised builder’s opening installation (hole-in-the-wall fireplace) 18
Figure 3 – Typical unconcealed gas supply system to a gas fire 20
5 Foreword
7 1 Scope
a) fixed appliances that satisfy all the requirements of BS EN 14829;
b) fixed appliances that satisfy the combustion requirements of BS EN 14829;
c) convector heaters of nominal heat input not exceeding 4.2 kW in the form of greenhouse heaters in respect of single appliance installations.
a) mobile and portable appliances conforming to BS EN 449;
b) appliances in motor caravans and touring caravans;
c) appliances in boats;
d) installations in agricultural premises; or
e) installations in transportable accommodation units.
8 2 Normative references
9 3 Terms and definitions
3.1 air vent
3.2 builder’s opening
3.3 conservatory
3.4 convector heater
3.5 fireguard
3.6 fireplace opening
3.7 fireplace recess
3.8 fire surround
3.9 flue box
3.10 flueless appliance (type A)
3.11 gas fire
3.12 greenhouse
10 3.13 greenhouse heater
3.14 habitable space
3.15 heating stove
3.16 imitation fuel
3.17 installation instructions
3.18 internal space
3.19 radiant
3.20 superimposed hearth
3.21 ventilation
4 Exchange of information and planning
4.1 General
11 4.2 Design considerations for installations other than in a greenhouse
a) potential for problems of condensation;
b) whether the appliance input is such that the appliance may be installed in its intended location in conformity with the input and ventilation requirements of Clause 8;
c) presence of any flues which might have an adverse effect on the appliance performance unless closed off (see 9.1);
d) presence of other heating appliances in the room space;
e) position of heating appliances in relation to probable position of fixtures, furniture and curtains;
f) availability of gas supplies;
g) availability of electrical supply (where applicable);
h) positioning of air vent(s) (see 8.1); and
i) installation of an independent electrical carbon monoxide alarm conforming to BS EN 50291 in accordance with BS EN 50292 and the appliance and/or alarm manufacturer’s instructions.
12 4.3 Design considerations for installations in a greenhouse
a) the potential for problems of condensation;
b) that the appliance input is such that the appliance may be installed in its intended location in conformity with the input and ventilation requirements of 8.4;
13 c) availability of gas supply; and
d) availability of electrical supply (where applicable).
5 Appliances
a) The installer should ensure that the packaging and the appliance itself are marked with at least the following information:
14 b) The rated heat output of the appliance should be borne in mind during selection.
c) Any appliance, other than a greenhouse heater, described in this standard can be used to provide supplementary heat to a room…
d) In some situations it may be desirable to provide two appliances in the same room or internal space rather than one, in order…
e) For information purposes, Figure 1 gives examples of flueless gas appliances.
6 Materials and components
15 Figure 1 Examples of flueless appliances
16 7 Location
a) it incorporates a safety control designed to shut down the appliance before there is a build up of a dangerous quantity of the products of combustion in the room concerned; and
b) the manufacturer’s instructions specifically allow installation in such locations.
8 Appliance sizing and ventilation
8.1 General
17 a) Floor vents, unless ducted to outside air, can draw moisture from under the house floor. Combined with moisture from the appliance combustion products, this might lead to condensation in the room.
b) Air vents sited too close to an appliance can cause draught disturbance leading to poor combustion, sooting and carbon monoxide.
c) Existing ventilators in redundant chimneys may need to be sealed and the ventilator re-sited.
d) Areas identified as requiring action for radon gas will be known due to local publicity but, in case of doubt, further advice can be obtained from a building control officer at the local authority headquarters.
e) Equivalence to an openable window is given in BS 5440-2:2000, Table 4.
8.2 Heat input, room sizing and ventilation
a) in accordance with the manufacturer’s instructions; or
b) in the absence of specific ventilation and room sizing requirements in the manufacturer’s instructions, in accordance with BS 5440-2.
18 8.3 Multi-appliance installations
8.3.1 Gas appliances
a) The total open-flued space heating appliance requirement (i.e. 5 cm2/kW total rating).
b) The greatest individual requirement of any other type of appliance. For an open-flued non space-heating appliance the requirement shall be 5 cm2/kW rating.
8.3.2 Oil or solid fuel fired appliances
19 8.4 Greenhouse heater installations
8.4.1 Integral greenhouses
8.4.2 Independent greenhouses
9 Appliance fixing
9.1 General
20 a) into an opening under an existing flue,
b) in front of a fireplace opening,
c) close to an existing flue, or
d) in close proximity to an air vent and any other ventilator, e.g. one serving a redundant chimney (see 8.1),
9.2 Siting
21 a) the compatibility between the surround and the fire should be confirmed at the planning stage;
b) fire surrounds are available which have been tested and found satisfactory for use with gas fires, e.g. in terms of temperature rating compatibility;
c) any methods of securing and sealing a surround and hearth to a floor and wall given in the fire surround manufacturer’s instructions;
d) whether the appliance manufacturer provides any special instructions for the sealing of the surround to the wall to limit temperature effects.
9.4 Greenhouse heater fixing
10 Fire precautions
10.1 User protection
a) installing an appliance that is fitted with an integral guard which conforms to BS 7977-1:2002, 6.4.8; or
b) a tactile separator in the form of either:
22 10.2 Floor protection from radiant heat
10.2.1 General
10.2.2 Materials
10.2.3 Thickness
10.2.4 Dimensions
23 10.3 Appliances in raised builder’s openings (hole-in-the-wall applications)
a) the appliance is installed in accordance with the manufacturer’s instructions and the instructions state that no hearth is required to protect the floor covering from radiant heat under these circumstances; or
b) the appliance is installed so that every part of any flame or incandescent part of the fire-bed is at least 225 mm vertically above any carpet or floor covering; or
c) the hearth beneath the appliance, or into which the appliance is set, extends in front of any flame or incandescent part of the fire-bed such that the sum of the x + y dimensions in Figure 2 is at least 225 mm to any carpet or floor covering.
24 Figure 2 General layout of a raised builder’s opening installation (hole-in-the-wall fireplace)
10.4 Heating stoves
10.5 Protection at rear of appliance
10.6 Side wall protection
10.6.1 Fire
25 10.6.2 Stove
10.7 Shelf protection
11 Gas supply
26 Figure 3 Typical unconcealed gas supply system to a gas fire
27 12 Electricity supplies and wiring
a) a fused double-pole switch unit with flex outlet (spur box); or
b) a fused three-pin plug and a shuttered socket-outlet.
13 Commissioning
28 14 Instructions and use of fireguards
15 Advice to be given to the user
15.1 Operating instructions
29 15.2 Maintenance
31 Annex A (informative) Guidance on ventilation requirements for flueless gas fires
A.1 General
A.2 Application of BS EN 14829, Annex G – mass balance model
a) for CO
b) for NO2
32 c) for CO and NO2
A.3 Application of BS 5440-2:2000
a) the appliance satisfies the combustion requirements of BS EN 14829, 6.8; and
b) the appliance has an NO2 emission rate of class 5 or better (BS EN 14829, Table 1); and
c) the manufacturer’s instructions specify a minimum room size and ventilation conforming to the requirement “Space heater in a room” of BS 5440-2:2000, Table 4.
A.4 Direct measurement
A.4.1 General
A.4.2 Method
33 a) the operator can, at any time, observe the appliance in operation, the appliance being sited on one of the narrower walls;
b) sampling of the room atmosphere for CO2, CO and NO2 concentrations can be performed at the geometric centre of the room, the samples being reintroduced into the room after analysis;
c) the air drawn mechanically through the test room is taken from an area that is uncontaminated by combustion products and/or hydrocarbons;
d) the air extracted from the test room containing the combustion products cannot contaminate the air being drawn into the test room;
e) the appliance can be supplied from a gas source outside the room, the regulator being outside the room;
f) the temperature measured at the geometric centre of the room can be maintained between 20 ˚C and 40 ˚C when measured at the geometric centre of the room using a thermocouple shielded both from draughts and radiation;
g) the atmosphere in the room is maintained as a homogenous mixture.
34 A.4.3 Test
35 Bibliography
[1] The Gas Safety (Installation and Use) Regulations, No. 2451, London: The Stationery Office.
[2] The Gas Safety (Installation and Use) Regulations (Northern Ireland) 2004, No. 63, London: The Stationery Office.
[3] The Gas Appliances (Safety) Regulations 1995, No. 1629, London: The Stationery Office.
[4] The Building Regulations 2000, No. 2531, as amended, London: The Stationery Office.
[5] The Building (Scotland) Regulations 2004, No. 406, London: The Stationery Office.
[6] The Building Regulations (Northern Ireland) Statutory Rules 2000, No. 389, as amended, London: The Stationery Office.
[7] The Gas Safety (Application) (Isle of Man) Order 1996, SD 326/96, London: The Stationery Office.
[8] The Health and Safety (Gas) (Guernsey) Ordinance, 2006.
36 [9] INSTITUTION OF GAS ENGINEERS AND MANAGERS, IGE/UP/8: Gas in caravans, holiday homes and boats, London: 2000.
[10] The Asbestos (Prohibition) Regulations 1999, as amended, London: The Stationery Office.
[11] BRITISH GAS plc: IM/28: Appliances in commercial garages (1st edition) (available from Institution of Gas Engineers, Loughborough), 1993.
[12] Approved Document B (Fire Safety) – Volume 1: Dwellinghouses, The Stationery Office, London: 2006.
[13] Approved Document P, Electrical safety, The Stationery Office, London: 2004.
[14] INSTITUTION OF GAS ENGINEERS AND MANAGERS: IGE/UP/1, Soundness testing and purging of industrial and commercial gas installations, Loughborough: 1995.
[15] INSTITUTION OF GAS ENGINEERS AND MANAGERS: IGE/UP/1A, Soundness testing and direct purging of small low pressure industrial and commercial Natural Gas installations, Loughborough: 1998.
[16] INSTITUTION OF GAS ENGINEERS AND MANAGERS, IGE/UP/1B: Tightness testing and purging of domestic sized Natural Gas installations, London: 2002.
[17] LP GAS ASSOCIATION: LPGA TM 83: Gas soundness testing of LPG service pipework, installation pipework and appliances in holiday homes, caravans and motor homes, Ringwood: June 2005.
[18] CORGI: The gas industry unsafe situations procedure – Dealing with unsafe situations in customers’ premises.
[19] EH40/2005, Workplace exposure limits: Containing the list of workplace exposure limits for use with the Control of Substances Hazardous to Health Regulations 2002 (as amended), Environmental Hygiene Guidance Note EH40, Sudbury: HSE Books, 2005.

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BS 5871-4:2007
$128.58