Air Inlet (External / Direct Air Connection
)
(100mm diameter)
Rear View Of Stove
Page 6
Booklet 722
3.3 Air For Combustion
All stoves require ventilation to burn safely and correctly. There are a number of
requirements that need to be met when installing a stove, for example, allowing
for the permeability of the house (air permeability is the general seepage of air
into the house via air vents, doors and windows etc.)
There must always be a permanent means of providing air for combustion into the room
in which the stove is installed. Air starvation will result in poor flue draw and may cause
smoke to leak into the room.
For all installations it is recommended that a permanent vent with a total free area of at
least 550mm2 for every kW above 5kW should be connected directly to the outside air.
Installations in properties built after 2008 should have their vent increased by a further
330mm2 for each of the first 5kW. Alternatively, this air can be supplied through an
external wall of an adjacent room, which itself has to be connected to the room the
appliance is installed by a permanent vent of the same size.
Note: If the appliance is fitted with a draught stabiliser (or if one is fitted to the flue pipe
or chimney in the same room as the appliance) then the permanent air entry opening
(or openings) should be increased by 300mm2 for each kW of rated output up to 5kW
and an additional 850mm2 for each kW output over 5kW.
If there is more than one appliance in the property then each appliance must be supplied
with adequate combustion air so that all appliances can be lit simultaneously.
The positioning of any air vent must be so that it cannot be liable to blockage or
obstruction. Ideally it should also be positioned where it is unlikely to cause a cold
draught. It should not be positioned in the fireplace recess.
For more detailed guidelines on required ventilation sizes please refer to the Document J
Building Regulations (Combustion Appliances) at the www.planningportal.gov.uk website.
If you plan to use an external air supply on a stove, (sometimes referred to as direct air
supply) then the rear connection spigot can be used to affix the incoming air supply in a
suitable 100mm inside diameter flexible duct (see Fig.1).
Please note, the appliance is classed a partially sealed and the supply from the air inlet
duct, feeds both the primary and secondary air controls.
WOODFORD Stove
Installation Guide
Fig. 1 . External Air
