Drolet AUSTRAL NG1800 Owner's Manual page 16

A- 25 mm (1 po.) minimum;
1- Combustible wall;
2- Non-combustible spacer;
3- Brick.
Graphic 6
A- 25 mm (1 po.) minimum;
1- Combustible wall;
2- Non-combustible spacer;
3- 0.61 mm (0.024") sheet metal;
4- Brick.
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