Nectre Fireplaces 800 Operating Instructions Manual page 6
Wall fire heater
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- Installation & operating instructions manual (16 pages) ,
- Operating instructions manual (17 pages)
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Floor Protection
Where the floor material is heat sensitive then a floor protector shall extend under
and in front of the heater.
If the base of the heater is 590mm or more above the floor then the floor
protector must be a minimum of 6mm fibro cement sheet 1metre wide
extending under the heater and 300mm in front of the wall. (300mm in
front of the door opening and 200mm either side). An alternative to fibro
cement in front of the fire opening could be a slate hearth or row of
300mm tiles.
If the base of the heater is less than 590mm above a heat sensitive floor
then a hearth in front of the heater shall be used according to clause 3.3.3
(b)(iii) of AS/NZ 2918:2001. This shall be constructed of continuous heat
tolerant material not less than 15 mm thick. The top surface of the floor
protector shall be of heat resistant material. The hearth shall be separated
from the floor by means of heat resistant spacers forming an air gap of not
less than 25 mm between the hearth and the floor. The total plan area of
the air gap shall be not less than 90% of the area of the hearth. The
hearth shall be a minimum of 1 m wide (200 either side of the firebox
opening) and 500mm deep from firebox opening and shall be ventilated on
each side with an opening of 25 x 300 or an area calculated by the hearth
perimeter x 2.
Ventilation
The enclosure around the heater must be ventilated. Fit vents with a "free area"
of at least 14000 mm² at the top and bottom of the enclosure. (Standard wall
vents 230mm x 150mm can provide 7000 mm² each.) This applies to non
combustible enclosures as well as framed enclosures. The purpose of the vents
is to allow cooler air to be drawn into the enclosure through the bottom vent, and
warm air out through the top vent via natural convection back into the room.
It is suggested that the top vent be close to the ceiling so as to allow the warm air
in the wall cavity to escape.
Suggested examples of venting could be:-
In the side walls of the enclosure top and bottom as seen in the suggested
framing further below.
Above and below the heater in the front wall of the enclosure.
If heater is set into an internal wall, bottom and top vent(s) could be in the
adjacent room behind.
6
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