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1、BRITISH STANDARD BS 5440-2: 1989 Incorporating Amendment No. 1 Installation of flues and ventilation for gas appliances of rated input not exceeding 60 kW (1st, 2nd and 3rd family gases) Part 2: Specification for installation of ventilation for gas appliances Licensed Copy: sheffieldun sheffieldun,
2、na, Mon Dec 04 16:11:28 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5440-2:1989 This British Standard, having been prepared under the direction of the Gas Standards Policy Committee, was published under the authority of the Board of BSI and comes into effect on 28 February 1990 BSI 11-1998 The fol
3、lowing BSI references relate to the work on this standard: Committee reference GSE/30 Draft for comment 85/79059 DC ISBN 0 580 18005 0 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Gas Standards Policy Committee (GSE/-) to Technical Co
4、mmittee GSE/30, upon which the following bodies were represented: British Flue and Chimney Manufacturers Association British Gas plc Confederation for the Registration of Gas Installers Consumer Standards Advisory Committee of BSI Department of the Environment Department of Trade and Industry (Consu
5、mer Safety Unit, CA Division) Health and Safety Executive Institute of Domestic Heating and Environmental Engineers Institution of Gas Engineers Liquefied Petroleum Gas Industry Technical Association (UK) Society of British Gas Industries Trades Union Congress Co-opted members Amendments issued sinc
6、e publication Amd. No.Date of issueComments 812815 March 1994 Indicated by a sideline in the margin Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:11:28 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5440-2:1989 BSI 11-1998i Contents Page Committees responsible Inside front cover Forewordi
7、i 1Scope 1 2Definitions1 3Materials for air vents and ducts1 4Size and position of air vents1 5Effect of extract fans5 Appendix A List of standards recommended for use with this standard10 Figure 1 Air vent positions for a room-sealed appliance in a compartment6 Figure 2 Air vent positions for an op
8、en-flued appliance in a room or internal space7 Figure 3 Air vent positions for an open-flued appliance in a compartment8 Table 1 Minimum air vent free area for compartments: room-sealed appliances2 Table 2 Minimum air vent free area for compartments: open-flued appliances3 Table 3 Minimum permanent
9、 opening free area for flueless appliances4 Publications referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:11:28 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5440-2:1989 ii BSI 11-1998 Foreword This Part of BS 5440 has been prepared under the direction of the Ga
10、s Standards Policy Committee. It is a revision of BS 5440-2:1976, which is withdrawn. In this revision of BS 5440-2 greater detail has been included regarding the positioning of air vents, and the requirements for flueless appliances have been simplified, where experience has shown that room volume
11、limits and associated air vent free areas can be safely rounded. At the same time in line with policy on metrication the use of imperial units has been discontinued. This revision recognizes investigative work carried out by British Gas plc and other bodies into the magnitude of adventitious ventila
12、tion openings, which are always present in rooms to some degree. This work shows that the lower limit of 35 cm2 applied in the preparation of BS 5440-2:1976 remains valid and this figure has been allowed for in this revision in specifying the ventilation requirements for open-flued appliances. NOTET
13、his standard has been written in the form of a practice specification (see clause 6 of PD 6501-1:1982). To comply with this specification, the user has to comply with all its requirements. He may depart from recommendations, but this would be on his own responsibility and he would be expected to hav
14、e good reasons for doing so. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. In particula
15、r, attention is drawn to the following. a) Statutory Instrument 1358:1984: The Gas Safety (Installation and Use) Regulations 1984 b) Statutory Instrument 1065:1985 (as amended): Building Regulations 1985 c) Statutory Instrument 1596:1981 (as amended): The Building Standards (Scotland) Regulations 19
16、81 Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 10, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the i
17、nside front cover. Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:11:28 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5440-2:1989 BSI 11-19981 1 Scope This Part of BS 5440 specifies the installation requirements for the ventilation of new or replacement gas appliances for domestic or non-
18、domestic purposes utilizing 1st, 2nd or 3rd family gases and with a rated heat input not exceeding 60 kW but excluding: a) installations covered by the requirements of BS 5482-2 and BS 5482-3; b) decorative fuel effect gas appliances of the type covered by BS 67141). NOTE 1Additional standards that
19、should be consulted are listed in appendix A. NOTE 2The titles of the publications referred to in this standard are listed on the inside back cover. 2 Definitions For the purposes of this Part of BS 5440 the definitions given in BS 1179:1967 and BS 1179-6 apply, together with the following. 2.1 air
20、vent a non-adjustable purpose-made grille designed to allow the passage of air at all times 2.2 air vent free area the unobstructed cross-sectional area of an air vent, i.e. the arithmetic sum of the areas of the individual apertures 2.3 internal space an interior space which is not a room, such as
21、a hall, passage-way, etc 2.4 protected shaft a stairway, lift, escalator, chute, duct or other shaft which enables persons, things or air to pass from one compartment to another 2.5 room volume the nominal (gross) volume of a room or internal space, i.e. the product of the area bounded by the walls
22、and the height 2.6 ventilation the process of supplying fresh air to, and removing vitiated air from, a room or internal space 3 Materials for air vents and ducts Air vents and ducts shall be such that they are dimensionally stable and corrosion resistant and suitable for their intended use. When se
23、lecting an air vent or duct due consideration shall be given to its siting and environment. Components containing asbestos shall not be used. 4 Size and position of air vents 4.1 General 4.1.1 Air vents communicating directly with outside air 4.1.1.1 A ventilation opening across a cavity wall shall
24、include a continuous duct across the cavity. The duct shall be installed in such a way that it does not impair the water resistance of the cavity. 4.1.1.2 Where an air vent is sited so that any part of it is vertically above a balanced flue terminal it shall not be less than 300 mm from the terminal
25、 whether or not the flue is fitted with a fan. Where an air vent is sited adjacent to an open flue terminal it shall be not less than: a) 600 mm from any part of the terminal on a natural draught flue; b) 300 mm from any part of the terminal on a fanned draught flue. COMMENTARY AND RECOMMENDATIONS O
26、N 4.1.1. The air vent should not be located in a position where it is likely to be easily blocked, e.g. by leaves or snow, or flooded, or where contaminated air can be expected, e.g. car ports. An air vent should be located so that the air currents produced will not pass through normally occupied ar
27、eas of a room. This can be achieved by: a) siting the appliance in a compartment having vents communicating directly with outside air; b) siting the vent at or near ceiling height; c) siting the vent at a point adjacent to the appliance. The apertures of an air vent should be such as to prevent the
28、entry of a 10 mm diameter ball but allow entry of a 5 mm diameter ball. No gauze or screen should subsequently be incorporated or fitted. 4.1.2 Air vents not communicating directly with outside air 1) In course of revision. Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:11:28 GMT+00:00 20
29、06, Uncontrolled Copy, (c) BSI BS 5440-2:1989 2 BSI 11-1998 4.1.2.1 An air vent in an internal wall, other than a compartment wall, shall be located not more than 450 mm above floor level in order to reduce spread of smoke in the event of fire. 4.1.2.2 No air vent shall communicate with a ventilated
30、 roof or underfloor space if that space communicates with other premises. COMMENTARY AND RECOMMENDATIONS ON 4.1.2.2. Where an air vent communicates with a roof space due consideration should be given to the avoidance of problems of condensation that could result from lower ambient temperatures in th
31、e roof space. An air vent in a roof space should be sited so as to avoid blockage by, for example, insulation material. 4.1.2.3 No air vent shall penetrate a protected shaft. 4.1.3 Air vents in series. Where three or four air vents are in series the free area of each air vent shall be increased by a
32、t least 50 % over that required for the corresponding single air vent. COMMENTARY AND RECOMMENDATIONS ON 4.1.3. Where two air vents are in series experience has shown that the additional flow resistance is small enough to be acceptable without the need for an increase in the area of each over that o
33、f a single air vent. 4.1.4 Ducts. The cross-sectional area of a duct to be fitted to an air vent shall be not less than the area of the opening required to accommodate that air vent. COMMENTARY AND RECOMMENDATIONS ON 4.1.4. Where the cross-sectional shape of the duct is different to that of the air
34、vent(s) to which it is connected, then either the cross-sectional area of the duct may need to be increased or adaptors may need to be used to ensure that the duct is not restricted. 4.2 Room-sealed appliances installed in a compartment 4.2.1 Where a room-sealed appliance is in a compartment, air ve
35、nts to the compartment, sized in accordance with Table 1, shall be provided at both high and low levels. COMMENTARY AND RECOMMENDATIONS ON 4.2.2. The purpose of the vents is to supply air for cooling. Suitable air vent positions are illustrated in Figure 1. There are no requirements for the ventilat
36、ion of a room-sealed appliance installed in a room or internal space. Table 1 Minimum air vent free area for compartments: room-sealed appliances 4.2.2 Where two or more appliances are installed in the same compartment, whether or not they are supplied as a combined unit, the aggregate rated input s
37、hall be used to determine the air vent free area from Table 1. 4.2.3 Where the low level vent is supplied with air by a duct from a higher level, the duct shall be separate from any duct used for supplying the high level vent. No high level vent shall be supplied with air by a duct from a lower leve
38、l. Ducts shall be sized in accordance with 4.1.4. COMMENTARY AND RECOMMENDATIONS ON 4.2.3. Both high and low level vents should communicate either with the same room or internal space, or with the outside air at the same wall. The vertical distance between the high and low level vents should be as g
39、reat as is practicable. 4.2.4 A compartment containing a room-sealed appliance shall be labelled to warn against blockage of the vents. COMMENTARY AND RECOMMENDATIONS ON 4.2.4. Suitable wording for the label is as follows: Important For Your Safety Do not block or restrict any air grilles or louvres
40、 in the walls, door, floor or ceiling of this compartment. 4.3 Open-flued appliances 4.3.1 Open-flued appliance installed in a room or internal space. Where an open-flued appliance with a rated input exceeding 7 kW is installed in a room or internal space, that room or internal space shall be provid
41、ed with a permanent opening having a minimum free area of 4.5 cm2 for every kW of appliance maximum rated input in excess of 7 kW. The permanent opening shall be either direct to outside air, or to an adjacent room or internal space which itself has an opening of at least the same free area direct t
42、o outside air. In a domestic premises the permanent opening shall be an air vent. Vent positionCompartment ventilated: to room or internal space direct to outside air cm2 per kW of appliance maximum rated input cm2 per kW of appliance maximum rated input High level94.5 Low level94.5 Licensed Copy: s
43、heffieldun sheffieldun, na, Mon Dec 04 16:11:28 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5440-2:1989 BSI 11-19983 COMMENTARY AND RECOMMENDATIONS ON 4.3.1. The purpose of the permanent opening is to provide air for combustion, and correct operation of the flue. Suitable air vent positions are il
44、lustrated in Figure 2. There are no requirements for the installation of an air vent in a room or internal space containing an open-flued appliance which has a rated input not exceeding 7 kW. 4.3.2 Open-flued appliance installed in a compartment 4.3.2.1 Where an open-flued appliance is installed in
45、a compartment, air vents to the compartment, sized in accordance with Table 2, shall be provided at both high and low levels. COMMENTARY AND RECOMMENDATIONS ON 4.3.2.1. The purpose of the vents is to provide air for combustion, correct operation of the flue and compartment cooling. Suitable air vent
46、 positions are illustrated in Figure 3. Where an open-flued appliance is installed in a balanced compartment specific installation requirements, including those for ventilation, apply. These are given in BS 5440-1. Specialist advice should also be obtained. Table 2 Minimum air vent free area for com
47、partments: open-flued appliances 4.3.2.2 Where two or more appliances are installed in the same compartment, whether or not they are supplied as a combined unit, the aggregate rated input shall be used to determine the air vent free area from Table 2. 4.3.2.3 Where the low level vent is supplied wit
48、h air by a duct from a higher level, the duct shall be separate from any duct used for supplying the high level vent. No high level vent shall be supplied with air by a duct from a lower level. Ducts shall be sized in accordance with 4.1.4. COMMENTARY AND RECOMMENDATIONS ON 4.3.2.3. Where practical
49、both high and low level vents should communicate either with the same room or internal space, or with the outside air at the same wall. The vertical distance between the high and low level vents should be as great as is practicable. 4.3.2.4 Where the compartment air vents communicate with a room or internal space that room or internal space shall itself be provided with a permanent opening in accordance with 4.3.1. 4.3.2.5 A compartment containing an open-flued appliance shall be labelled to warn against blockage of the vents. COMMENTARY AND RECOMMENDATIONS ON