BK 680 Specific
Page 7
ECOBOILER Cassette Installation Guide
3.3 Combustion air requirements
All stoves require ventilation to burn safely and correctly.
The Stratford Ecoboiler Cassette differs from conventional stoves in that air
for combustion is only supplied from an external source rather than the
room or dwelling.
The fitting of the external air allows the stove to be installed in a room that
may otherwise be sealed to and extent that would prohibit the correct and
safe burning of the stove. This may also apply to houses in general sealed
to a very high level to meet various energy efficiency targets.
Therefore the requirements normally associated 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.) are not applicable.
The product is factory fitted with a with an air supply adaptor located on the
base of the appliance that will accept a flexible pipe of a diameter 102mm
externally. See Fig. 1 & 4 for details.
The air duct fitted must be of minimum diameter 100mm, non combustible
and ducted to the outside in a manner that will not effect the performance of
the stove.
No sharp bends and a maximum duct length of 10 metres is permissible.
Where the duct terminates on an external wall ensure that there is no risk of
blockage with leaves or accidental placement of items, ensure there is no
risk of ingress of moisture or access for rodents.
Avoid fitting the air inlet pipe through a wall that may be unduly effected by
prevailing winds that may cause a suction on the pipe bringing combustion
products back down the flue.
In extreme cases the placement of the terminal on the external wall may
pose problems and remedial action may be required to relocate the terminal
or provide two terminals on opposite walls to balance the wind effect.