© 2007-2008 Broseley Fires Ltd
18 D. HEARTH REQUIREMENTS
It is essential that the hearth / base on which the appliance will stand is strong enough to support the weight of the
appliance and the chimney / flue. If not, independently support.
It must be level and made of a suitably robust, non combustible material.
The positioning of the appliance and dimensions of the hearth must comply with current building regulations.
A constructional hearth needs to be at least 125mm thick.
It must extend at least 150mm each side of the appliance.
It must project at least 300mm in front of the appliance.
A change in level of at least 12mm is advised to mark the perimeter.
There should be a 50mm air space under the constructional hearth if combustible material is present OR the
combustible material should be 250mm below the top of the hearth.
The superimposed, decorative hearth is laid on top of the constructional hearth.
STOVE CLEARANCES TO
FLAMMABLE
MATERIALS
•
The minimum distance from any flammable object, or one that is sensitive to heat, (furniture, wood, fabrics.
etc.) and from materials with flammable structure, must be 20 cm’s to the rear and on both sides.
•
In front of the appliance there must not be any flammable object or building material, sensitive to heat within
100 cm's.
•
Above the appliance, there must not be any flammable items within 70 cm
•
Never deposit / store any flammable materials near the stove.
STOVE CLEARANCES TO
NON - FLAMMABLE
MATERIALS
•
The minimum distance from any NON FLAMMABLE object, or one that is NOT sensitive to heat, (stone
brick slate etc.) and from materials with non flammable structure, must be 100 mm’s to the rear and on both
sides.
PLEASE REFER TO BUILDING REGULATIONS “WALLS ADJACENT TO HEARTHS” for further information.
Where the hearth abuts a wall and the appliance is more than 50 mm but not more than 300 mm away:
•
The thickness of the wall needs to be at least 75 mm.
•
The height of the wall needs to be at least 1.2M above the hearth.
18 E. ADDITIONAL VENTILATION
There must be sufficient free air for combustion into the room where the appliance is installed.
Permanent openings or vents must not be covered. Vents needs to be positioned carefully, they must be protected
from direct wind conditions. A baffle that has been specially designed to fit over the vent will protect it from the
effects of wind, but must not restrict the total vent area and must be secured in a way that prevents its movement.
Regular inspection of any vents is critical to ensure that the vent has not become restricted.
The appliance may require up to 20 m
3
/hour of combustion air. The natural recirculation of air must be guaranteed
by having permanent ventilation to the outside.
An extractor fan, cooker hood or similar product, installed in the same room, or in a room nearby; that sucks air out
(aspirating); may negatively affect the functions of your appliance.
If the room contains more than one appliance; of the type that requires combustible air;
a calculation will need to be made to re-calculate the permanent air vent requirement.
