Heatilator Birmingham BIR42-B Installation Manual page 29

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 6.1
R = 1/k x inches of thickness
Table 6.2
Hearth Extension Insulation Alternatives, R Value = 2.06
Material
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Heatilator • Birmingham 42-B Installation Manual • 4059-715 • Rev AD • 06/23
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.
12 in.
(305 mm)
66 in.
(1676 mm)
Figure 7.4 Hearth Extension Dimensions
1 in.
1 in.
 LQ
1 in.
42 in.
12 in.
(1067 mm)
(305 mm)
20 in. (508 mm) Minimum
Surfaces must be
covered with non
combustible material