4
3.1.2 Corner Installation
Corner Installation - minimum clearances
Model
C
F
B100
(rear flue shield)
400
300
B100
(decro-mesh)
400
300
*Decro-mesh installation requires a 490mm inner reflector
3.2
Floor Protector (Hearth)
Unless the heater will be standing on a heat resistant floor
such as concrete slab with slate or tiles, it will be necessary to
provide a floor protector (hearth).
The dimensions given above (Section 3.1) are the minimum
required for the floor protector to extend beyond the firebox
door opening. It must extend no less than 300 mm in front of
the door opening, no less than 200mm either side of the door
opening, and extend under the heater.
It may be desirable, for example aesthetic reasons, for the
floor protector to be larger than these minimum dimensions.
The floor protector can be constructed of either: -
a)
toughened glass no less than 10mm thick, OR
b)
Non-combustible material no less than 7.5mm thick
and with a thermal conductivity not greater than
0.33W/m ⁰K, e.g. compressed cement sheet.
The floor protector may be laid directly on the combustible
floor.
For more details and variations on floor protectors refer to
AS/NZS 2918:2001 Clause 2.2, 3.3.1, & 3.3.2.
If it is necessary to install a heater closer to a combustible
surface than the stated requirements in Section 3 of this
Installation Guide, it must be done in accordance with
Australian Standard AS/NZS 2918:2001 Section 3, Tables 3.1 &
3.2.
Shield Construction: The shield shall be constructed from a
heat resistant material. The shield must be fixed to the surface
that requires protection and NOT the heater.
The Standard allows three options to reduce stated
clearances.
Single layer of continuous material with Minimum Air Gap of
12mm—Clearance Factor = 0.40
Single layer of continuous material with Minimum Air Gap of
25mm—Clearance Factor = 0.30
Two spaced layers of continuous material with Minimum Air
Gaps of 12mm + 12mm—Clearance Factor = 0.20
The shielding must be open at the top and bottom (vented) to
allow a continuous air flow. It is this air flow that keeps the
surface requiring protection cool. Fixings should not impede
this air flow.
The shielding needs to go far enough along and up the wall so
that the original side and rear required clearances are not
compromised. As the flue is now closer to the wall the
shielding should also protect the wall from the flue pipe.
For example:
Side wall clearance for the B100 is 700mm.
A 12mm gapped shield on the wall with a factor of 0.40.
Calculate: - 700mm x 0.40 = 280mm. This is the new side wall
minimum clearance.
The shielding needs to be large enough so that none of the
original clearances of 700mm are compromised.
4. REDUCING CLEARANCES TO COMBUSTIBLES
Combustible Wall
Co
mb
u
sti
b
le
W
all
C
C
F
