Drolet AUSTRAL NG1800 Owner's Manual page 14

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A- Clearance to combustible material with no protection.
B- 500 mm (20 po.) minimum;
C- 25 mm (1 po.) minimum;
D- Between 25 mm (1 po.) and 75 mm (3 po.) ;
E- 75 mm (3 po.) minimum;
F- 450 mm (18 po.) minimum.
1- Wall shielding ;
2- Non-combustible spacers ;
3- Ceiling shielding ;
4- Combustible wall ;
5- Ceiling;
6- Heater (side view) ;
7- Heater (top view).
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