Heatilator BIR50 Owner's Manual page 40

12
Furnace at 750° C
WARNING!
R = 1/k x inches of thickness
Material
Marble
ASTM E 136, Standard
-
thick
12 in.
(305 mm)
50 in.
(1270 mm)
74 in.
(1880 mm)
thick Minimum thickness required
12 in.
(305 mm)
20 in. (508 mm) Minimum