Heatilator BIR42 Owner's Manual page 41

12
Furnace at 750° C
WARNING! Risk of re!
R = 1/k x inches of thickness
Material
Marble
ASTM E 136, Standard
High temperatures, sparks, em-
thick
12 in.
(305 mm)
42 in.
(1067 mm)
66 in.
(1676 mm)
thick Minimum thickness required
12 in.
(305 mm)
Raised Platform
20 in. (508 mm) Minimum
Flush Hearth
30 in. (762 mm) Minimum