Table of Contents
Advertisement
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.
Clearance factors for heat shields which are within 45 degrees of the vertical
Heat Shield Construction
Single layer of continuous
material
Single layer of continuous
material
Two spaced layers of
continuous material
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
Reducing Clearances
Minimum Air Gap
12mm + 12mm
(refer 4.5.2).
Dimension
12mm
25mm
Rear Clearance - 198mm (combustible to
stove)
Heat shield with 25mm air gap with
Heat Shield - Single layer of continuous
material with 25mm air gap.
Size 1018mm wide x 1222mm high
Reduced Rear Clearance - 59mm
(combustible to stove)
Calculation: 198mm x 0.3 = 59mm
Clearance
Factor
0.4
0.3
0.2
Unshielded Dimension for
Woodsman Tarras MKII
Woodsman Tarras MKII
9
Hide quick links:
Advertisement
Table of Contents
Need help?
Do you have a question about the AS/NZS 2918:2001 and is the answer not in the manual?
Questions and answers
Minimum distance WITH a heat shield to a freestanding wood burner
According to AS/NZS 2918:2001, the minimum distance to a Woodsman freestanding wood burner with a heat shield depends on the heat shield construction:
- Single 12 mm continuous material with air gap: clearance factor is 0.4
- Single 25 mm continuous material with air gap: clearance factor is 0.3
- Two spaced layers of 12 mm continuous material with air gap: clearance factor is 0.2
To find the minimum distance, multiply the unshielded clearance by the relevant clearance factor. The specific unshielded clearance is not provided in the context, so the exact minimum distance cannot be calculated.
This answer is automatically generated