Osburn 3500 - Page 33

Page 33
Installation and Operation Manual - Osburn 3500
CONSTRUCTIONS AND CLEARANCE FACTORS FOR APPLIANCES HEAT SHIELDS WHICH
ARE WITHIN 45
o
OF THE VERTICAL
HEAT SHIELD CONSTRUCTIONS
Minimum air gap
dimensions (mm)
Clearances
factor
Single layer of continuous material 12 0.40
Single layer of continuous material 25 0.30
Two spaced layers of continuous material 12+12 0.20
NOTES:
1. Masonry may be used as a heat shield material.
2. Where heat shields are used to reduce appliance clearance dimensions, additional flue shielding
may also be required. Refer to AS/NZS 2918:2001.
3. Non standard installations – Refer to AS/NZS 2918:2001 for guidance.
CONSTRUCTIONS AND CLEARANCE FACTORS FOR APPLIANCES HEAT SHIELDS WHICH
ARE MORE THAN 45
o
OFF THE VERTICAL
HEAT SHIELD CONSTRUCTIONS
Minimum air gap
dimensions (mm)
Clearances
factor
Single layer of continuous material 12 0.80
Single layer of continuous material 25 0.60
NOTES:
1. Masonry may be used as a heat shield material.
2. Where heat shields are used to reduce appliance clearance dimensions, additional flue shielding
may also be required. Refer to AS/NZS 2918:2001.