RELATIONSHIP TO COMBUSTIBLE MATERIALS
(F5.11) The requirements of F5.11 will be met where the temperature beneath the oil-fired appliance has been tested to, and is in accordance with, OFTEC Standard OFS A100 for boilers or OFS A101 for cookers.
(F5.12) The requirements of F5.12 will be met where the appliance is located on a hearth in accordance with the diagram to this specification -
Diagram to (F5.12): Locating an oil-fired appliance on a hearth
Diagram
Note:
1. The 150mm does not apply where the appliance is located in a fireplace recess, nor does it apply where the back or sides of the hearth either abut or are carried into a solid, non-combustible wall complying with (F4.19b).
(F5.13) The requirements of F5.13 will be met where the back, sides and top of the oil-fired appliance has been tested to and are in accordance with the OFTEC Standard OFS A100 for boilers or OFS A101 for cookers.
GAS-FIRED COMBUSTION APPLIANCE INSTALLATIONS
(F6.2) The requirements of F6.2 will be met where the gas-fired appliance carries a CE mark under the Gas Appliances (Safety) Regulations 1995.
(F6.3) The requirements of F6.3 will be met where air for combustion is provided in accordance with -
a. for a decorative fuel-effect gas appliance, BS5871: Part 3: 1991;
b. for an inset live fuel-effect gas appliance, BS5871: Part 2: 1991;
c. for any other gas-fired appliance, BS5440: Part 2: 1989.
SUPPLY OF AIR FOR COOLING
(F6.4) The requirements of F6.4 will be met where the gas-fired appliance, located in an appliance compartment, is provided with air for cooling in accordance with BS5440: Part 2: 1989.
REMOVAL OF PRODUCTS OF COMBUSTION
(F6.5) The requirements of F6.5 will be met where the shared flue is constructed and installed in accordance with Sections 6, 9 and 10 of BS5440: Part 1: 1990.
(F6.6) The requirements of F6.6 will be met where the chimney or flue-pipe is constructed and installed in accordance with -
a. for a decorative fuel-effect gas appliance, Clause 8 of BS5871: Part 3: 1991;
b. where the chimney or flue-pipe is in a timber frame building, Section 8 of publication ‘IGE/UP/7: ‘Gas Installation in Timber Framed Buildings’;
c. where the flue-pipe is supplied as an integral part of the combustion appliance, the appropriate recommendations of the combustion appliance manufacturer;
d. for any other gas-fired appliance, BS5440: Part 1: 1990.
(F6.7) The requirements of F6.7 will be met where the minimum area of the flue is provided in accordance with -
a. for a decorative fuel-effect gas appliance, Clause 8 of BS5871: Part 3: 1991;
b. for an inset live fuel-effect gas appliance, BS5871: Part 2: 1991;
c. for any other gas-fired appliance, BS5440: Part 1: 1990.
(F6.9) The requirements of F6.9 will be met where the outer wall of a double-walled flue-pipe is manufactured from -
a. aluminium, designation EN AW-1200 conforming to BS EN 573: Part 1: 1995;
b. aluminium alloy, designation EN AW-3103 or EN AW-5251 conforming to BS EN 573: Part 1: 1995;
c. stainless steel, number 1.4335 to BS EN 10088: 1995;
d. aluminium/zinc alloy coated steel of grades DX51D, DX52D, DX53D or DX54D with coating AZ185 or AZ150 conforming to BS EN 10215: 1995.
(F6.10) The requirements of F6.10 will be met where the outlet is separated from openings, obstructions or combustible material by at least the distances shown in the diagrams and tables to this specification -
Diagram 1 to (F6.10): Flue terminal positions for gas-fired appliances
Diagram
Table 1 to diagram (F6.10): Flue terminal positions for gas-fired appliances
|
Location [Note 1] |
Minimum distance to terminal in millimetres |
||||
|
Balanced flue, room-sealed appliance |
Open flue |
||||
|
Natural draught |
Fanned draught |
Natural draught |
Fanned draught |
||
|
A Directly below an opening, air brick, opening window, etc |
(0-7 kW) |
300 |
300 |
n/all |
300 |
|
(>7-14 kW) |
600 |
||||
|
(>14-32 kW) |
1500 |
||||
|
(>32-70 kW) |
2000 |
||||
|
B Above an opening, air brick, opening window, etc |
(0-32 kW) |
300 |
300 |
n/all |
300 |
|
(>32-70 kW) |
600 |
||||
|
C Horizontally to an opening, air brick, opening window, etc |
(0-7 kW) |
300 |
300 |
n/all |
300 |
|
(>7-14 kW) |
400 |
||||
|
(>14-70 kW) |
600 |
||||
|
D Below a gutter, or sanitary pipe work |
300 [2] |
75 [1] |
n/all |
75 [1] |
|
|
E Below the eaves |
300 [2] |
200 |
n/all |
200 |
|
|
F Below a balcony or carport roof |
600 |
200 |
n/all |
200 |
|
|
G Above ground, roof or balcony level |
300 |
300 |
n/all |
300 |
|
|
H From vertical drain/soil pipe work |
75 [1] |
75 [1] |
n/all |
75 [1] |
|
|
J From an internal or external corner |
600 |
300 |
n/all |
200 |
|
|
K From a surface or boundary facing the terminal |
600 |
600 [3] |
n/all |
600 |
|
|
L Vertically from terminal on same wall |
1500 |
1500 |
n/all |
1500 |
|
|
M Horizontally from terminal on same wall |
300 |
300 |
n/all |
300 |
|
|
N From a terminal facing the terminal |
600 |
1200 |
n/all |
1200 |
|
|
P From an opening in a carport (e.g. door, window) into the building |
1200 |
1200 |
n/all |
1200 |
|
|
R From a vertical structure on the roof [Note 4] |
n/app |
n/app |
[Note 5] |
n/app |
|
|
S Above an intersection with the roof |
n/app |
n/app |
[Note 5] |
150 |
|
Notes:
1. Notwithstanding the dimensions above, a terminal serving a natural draught and fanned draught appliance more than 5kW heat input should be at least 300mm and 150mm respectively from combustible material.
2. Where a natural draught flue terminates not more than 1m below a plastic projection or not more than 500mm below a projection with a painted surface, then a heat shield at least 1m long should be fitted.
3. The distance from a fanned draught appliance terminal installed at right angles to a boundary may be reduced to 300mm in accordance with Diagram 2 to (F6.10).
4. Vertical structure includes a chimney-stack, dormer window, tank room, lift motor room or parapet.
5. See Table 2 to (F6.10).
6. n/all = not allowed. n/app = not applicable.
Diagram 2 to (F6.10) Separation between a boundary and terminal at right angles
Diagram
Table 2 to diagram (F6.10): Minimum height P to the base of the terminal for roof mounted individual natural draught open-flued systems
|
Type of Roof |
Where N is more than 1.5 m |
Where N is not more than 1.5 m |
|
(a) where the flue system is internal |
All flue systems internal and external. |
|
|
Flat roof |
where the roof has a parapet - 600mm where the roof has no parapet - 250mm |
|
|
Pitched roof |
where the roof pitch is more than 45º from the horizontal - 1 m; where the roof pitch is not more than 45º from the horizontal - 600mm, except - where the terminal is a ridge terminal, situated on or above the roof ridge, no minimum dimension for P is required. |
|
|
(b) where the flue system is external |
||
|
All roofs |
600mm above the level of the adjacent roof edge |
600mm above the level of the vertical structure. |
PROTECTION FROM PRODUCTS OF COMBUSTION
(F6.11) The requirements of F6.11 will be met where the flue-pipe is manufactured from -
a. any material described in (F4.12a) (solid fuel); or
b. sheet metal as listed in BS715: 1993; or
c. fibre cement as described in BS7435: Part 1: 1991,
except -
when serving a gas-fired appliance that can operate in condensing mode; or
d. any other suitable material approved and tested under the relevant conditions by a notified body.
(F6.13) The requirements of F6.13 will be met where the flue-pipe is protected in accordance with Clause 4.2.5 of BS5440: Part 1: 1990.
RELATIONSHIP TO COMBUSTIBLE MATERIALS
(F6.16) The requirements of F6.16 will be met where the hearth is provided -
a. for a gas fire, convector heater and fire/back boiler, in accordance with Clause 11 of BS5871: Part 1: 1991;
b. for an inset live fuel-effect gas appliance, in accordance with Clause 11 of BS5871: Part 2: 1991;
c. for a decorative fuel-effect gas appliance, in accordance with Clause 10 of BS5871: Part 3: 1991;
d. for any other gas-fired appliance, by a solid, heat resistant, non-combustible, non-friable material at least 12mm thick and at least the plan dimension shown in the diagram to this specification -
Diagram to (F6.16d): Hearth size suitable for any other gas-fired appliance
Diagram
Note:
1. The 150mm does not apply where the appliance is located in a fireplace recess, nor does it apply where the back or sides of the hearth either abut or are carried into a solid, non-combustible wall complying with (F4.19b).
(F6.17) The requirements of F6.17 will be met where the gas-fired appliance and any associated draught diverters -
a. are separated from combustible material by a shield of non-combustible material at least 25mm thick or an air space of at least 75mm; or
b. where the appliance is CE marked, is installed in accordance with the manufacturer’s instructions.
Diagram to (F6.17a): Appliance separation from combustible material
Diagram