IMPORTANT: If the screen material is a single layer and is thick (e.g. concrete or brick),
the stove must be at least 150mm from the face of the screen, regardless of the
above allowable minimum distances between the stove and the wall.
NOTE: A 1200mm long polished flue heat shield must be fitted to the heater when the
above factors are used. The top of the shield must be at least 300mm below the
ceiling, and ideally the deflector should have a heat disperser at the top to spread
the hot air flowing up between the flue heat deflector and the flue. The usual
heat-proof ceiling plate must be fitted where the flue passes through the ceiling.
« Because the reduced wall clearances will bring the flue quite close to the rear wall,
(in the case of Type C shielding), it will be necessary to extend the wall shield
upwards to protect the wall for at least 300mm each side of the flue centreline.
The extended rear wall shield will, of course, finish just clear of the ceiling to
provide the top ventilation slot described above.
WALL SHIELD SIZES
Shields must extend at least 600mm each side of the heater centreline on side and rear
walls, or in the case of a corner installation, 1200mm each way from the corner. They
must be at least 1200mm high (measured from the hearth top).
WALL SHIELD FINISHES
Because the outer surface of the wall shield will become quite hot, any surface finish
must not be heat sensitive. Possibilities are high temperature paints or cladding with
ceramic tiles, slate etc.
HEARTH (FLOOR PROTECTOR) REQUIREMENTS
Unless your stove will be standing on an un-covered fireproof floor which extends at
least as far as the hearth size shown in the next paragraph, it will need to be mounted on
an insulating hearth to protect the floor from heat damage.
If the rearward extension of the hearth is not limited by a wall heat screen, it must
extend back from the stove feet by 300mm for the PITTSBURGH and FATSO, 325 for
the YUKON and 415 for the KLONDIKE or OREGON. The hearth must extend
forward from the feet of all models by 375mm. The hearth must extend at least 610mm
each side of the stove centreline. If not limited by the proximity of wall screening, a
1220 x 1220 hearth will be required for all models.
Solid hearth constructions such as concrete will conduct heat through to a heat-sensitive
floor if they are in contact with it, and they are therefore unacceptable.
Recommended hearth constructions are:-
• A reinforced concrete slab at least 50mm thick raised up from the floor on insulating
blocks to allow air to circulate beneath the slab. There must be at least a 12mm high
gap, and care must be taken to ensure that this amount of space will not be encroached
on by laying carpet etc. To be safe, a 25mm gap is recommended.
• A similar slab laid on two sheets of Micore 160 lying directly on the floor. If cast in
place, an impermeable sheet must be laid on top of the Micore to prevent water damage
from the concrete mix.
• Two sheets of Micore 160 (three for the Oregon), topped by a sheet of tile underlay
material and finished with ceramic tiles or other decorative finishes.
• Two sheets of Harditherm or Supalux, each sheet not less than 12mm thick, supported
on insulating blocks as for the first suggestion above.
FIXING THE STOVE IN POSITION
In New Zealand, the hearth must be secured to the floor, and the stove secured to the
hearth, or through to the floor, to prevent movement of the stove in the event of an
earthquake. The fastenings must be at least two in number (through diagonally opposite
feet), and should be not less than 12 gauge screws or the equivalent in coach bolts or
spring toggle fasteners.
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