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USEFUL CHARTS AND INFORMATION

CHIMNEY HEIGHTS

On solid fuel and wood burning applications , the minimum recommended flue height is 4.5m from above the fire place opening or top of the appliance . For shorter flue heights a draft calculation would be required in line with the flue sizing requirements of EN13384-1.

The maximum freestanding stack height above the roof for a traditional coursed masonry chimney is 4.5 times the narrowest horizontal part of the chimney.

VENTILATION REQUIREMENTS

It is very important that sufficient air for combustion and ventilation is provided to the room containing the appliance, to enable correct and efficient working of the appliance and chimney system. Reference should be made to the appliance manufacturer’s instructions and recommendations are also given in the Building Regulations Document J, see below:
 
CARBON MONOXIDE ALARMS

Where a new or replacement fixed solid fuel appliance is installed in a dwelling, a carbon monoxide alarm should be provided in the room where the appliance is located.
The carbon monoxide alarms should comply with BS EN 50291:2001. The carbon monoxide alarm must be located in the same room as the appliance:

a) On the ceiling at least 300mm from any wall or if it is located on a wall, as high up as possible (above any doors and windows), but not within 150mm of the ceiling and
b) between 1m and 3m horizontally from the appliance.
N.B Provision of a carbon monoxide alarm should not be regarded as a substitute for correct installation and regular servicing.

VENTILATION REQUIREMENTS FOR SOLID FUEL

Open appliance, such as an open fire with no throat, e.g. a fire under a canopy as in Diagram 23.

Type and amount of Ventilation (1)

Permanently open air vent(s) with a total equivalent area of at least 50% of the cross sectional area of the flue.

Open appliance, such as an open fire with a throat, as in Diagrams 22 and 29.

Type and amount of Ventilation (1)

Permanently open air vent(s) with a total equivalent area of at least 50% of the throat opening area. (2)

Other appliance, such as a stove, cooker or boiler, with a flue draught stabiliser.

Type and amount of Ventilation (1)

Permanently open air vents as below:
If design air permeability > 5.0m3/(h.m2) then
300mm2/kW for first 5kW of appliance rated output
850mm2/kW for balance of appliance rated output
If design air permeability ≤ 5.0m3/(h.m2) then
850mm2/kW of appliance rated output (4)

Other appliance, such as a stove, cooker or boiler, with no flue draught stabiliser.

Type and amount of Ventilation (1)

Permanently open vents as below:
If design air permeability > 5.0m3/(h.m2) then
550mm2/kW of appliance rated output above 5kW
If design air permeability ≤ 5.0m3/(h.m2) then
550mm2/kW of appliance rated output (4)