Heatilator Birmingham BIR36-B Installation Manual page 30

B. Hearth Extension, Building and Finishing
WARNING! Risk of Fire!
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• Protective metal hearth strips MUST be installed.
• Hearth extensions MUST be installed exactly as
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alternatives.
Table 7.1
R = 1/k x inches of thickness
Table 7.2
Hearth Extension Insulation Alternatives, R Value = 2.06
Material
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High temperatures, sparks, em-
Minimum
k per inch r per inch thickness
thick thick required
 
 
  
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14.3-20.0 0.07-0.05 29 1/2 - 41 1/4 in.
Heatilator • Birmingham 36-B Installation Manual • 4059-709 • Rev AB • 06/23
(305 mm)
Figure 7.4 Hearth Extension Dimensions
1 in.
1 in.
 LQ
1 in.
12 in.
36 in.
12 in.
(914 mm)
(305 mm)
60 in.
(1524 mm)
20 in. (508 mm) Minimum