Specifications

9
Reducing Clearances
The clearances that are provided on page 4 are to combustible materials. You can safely reduce
those clearances by following the instructions located in AS/NZS 2918:2001 table 3.1 and 3.2
You can reduce the clearances by placing a non-combustible heat shield, with an air gap behind it
and vented top and bottom, between the fire and the combustible wall. Masonry may be used as a
heat shield material. The heat shield must extend a minimum of 450mm beyond the top of the ap-
pliance and must be of appropriate width to ensure that the unshielded rear clearance is adhered to
beyond the sides of the heat shield. See example below.
Heat Shield Construction Minimum Air Gap
Dimension
Clearance
Factor
Single layer of continuous
material
12mm 0.4
Single layer of continuous
material
25mm 0.3
Two spaced layers of
continuous material
12mm + 12mm 0.2
Reduced Rear Clearance - 59mm
(combustible to stove)
Calculation: 198mm x 0.3 = 59mm
Heat Shield - Single layer of continuous
material with 25mm air gap.
Size 1018mm wide x 1222mm high
Unshielded Dimension for
Woodsman Tarras MKII
Heat shield with 25mm air gap with
Woodsman Tarras MKII
WARNING - This is only an example, you must refer to the full AS/NZS 2918:2001
document for more details and consult your local building inspector. Where heat shields
are used to reduce appliance dimensions, additional flue shielding may be required
(refer 4.5.2).
Clearance factors for heat shields which are within 45 degrees of the vertical
Rear Clearance - 198mm (combustible to
stove)