BS 3376:1994

Committees responsible
Foreword
Specification
Section 1. General
1.1 Scope
1.2 References
1.3 Definitions
1.4 Classification
Section 2. Construction
2.1 General
2.2 Minimum dimensions for category b) appliances
2.3 Firefront
2.4 Bottomgrate
2.5 Combustion air control
2.6 Ashpan
2.7 Ashpit and ashpit cover
2.8 Front firebars and fallplate
2.9 Deepening bar
2.10 Deepening plate
2.11 Gas ignition burner
2.12 Boiler
2.13 Boiler flue
2.14 Throat restrictor
2.15 Convection chamber and airways
2.16 Tools
2.17 Electrical
Section 3. Performance
3.1 Thermal performance
3.2 Banking performance
3.3 Condition of appliance after test
3.4 Throat restrictor
Section 4. Instructions and marking
4.1 Instructions
4.2 Marking
Annexes
A (normative) Test methods and conditions
B (normative) Test fuels
Tables
1 Materials for construction of appliance components
2 Minimum dimensions for category b) appliances
3 Minimum ashpan capacity
4 Relationship between gas ports and air ports
5 Range of adjustment of throat restrictor
6 Materials and minimum thickness of convection
      chamber and airways for appliances without fan
      assisted convection air
7 Materials and minimum thickness of convection
      chamber and airways for appliances with fan
      assisted convection air
8 Performance of category a) appliances burning test
      fuel A or B
9 Performance of category b) appliances burning test
      fuel A or B
10 Performance of category b) appliances burning test
      fuel C and designated as suitable for burning
      bituminous coal at enhanced efficiency
Figures
1 Typical inset open fire showing ash shedding area
2 Example of a suitable aeration device for a
      natural gas ignition burner
3 Gas connection elbows
4 Schematic diagram of boiler flue mouth entry
A.1 Datum level for various types of open fire
List of references

Specifies constructional, dimensional and performance requirements for inset or freestanding open fires giving space heating by convection in addition to radiation and designed to burn solid mineral fuels. Covers the following essential components of appliances the firefront, ashpit cover, bottomgrate, means of primary air control and a convection chamber. Also gives detailed tables, diagrams and annexes.

This British Standard specifies constructional, dimensional and performance requirements for inset or freestanding open fires giving space heating by convection in addition to radiation and designed to burn solid mineral fuels (i.e. bituminous coal, Welsh dry steam coal, anthracite or manufactured fuels derived from these coals).

NOTE This standard does not apply to inset open fires without convection (see BS 4834).

The standard covers appliances of nominal widths 350 mm, 400 mm, 450 mm, 500 mm and 550 mm designed for use either with fireplace components specified in BS 1251 or with special fireplace components or boilers supplied with the appliance.

The essential components of appliances covered by this standard are the firefront, bottomgrate, ashpit cover, ashpan, means of primary air control and a convection chamber.

Specified optional features may comprise a deepening bar, deepening plate, front firebars, undergrate gas igniter, boiler and throat restrictor. Fan(s) may be incorporated for supplying combustion air and/or convection air.

Appliances are designated as either intermittent or overnight.