Heatilator Birmingham BIR50-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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Table 6.1
R = 1/k x inches of thickness
Table 6.2
Hearth Extension Insulation Alternatives, R Value = 2.32
Material
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12 in.
(305 mm)
50 in.
(1270 mm)
74 in.
(1880 mm)
Figure 6.4 Standard Hearth Extension Dimensions
Heatilator • Birmingham BIR50-B Installation Manual • 4059-701• Rev AA • 06/23
High temperatures, sparks, em-
Minimum
k per inch r per inch thickness
thick thick required
 2.06 1 in.
 2.06 1 in.
1.92   LQ
 0.20 10 1/2 in.
 0.20 10 1/2 in.
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  1 in.
14.3-20.0 0.07-0.05 29 1/2 - 41 1/4 in.
12 in.
(305 mm)
20 in. (508 mm) Minimum
1. Fireplace Installed Flush on the Floor and
Hearth Extension Raised to Bottom of Firebox
Opening
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When creating the platform, allow for the thickness
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or grout.
Note: The bottom of the fireplace opening is 3-3/4 in. (95.3mm) above
the bottom of the fireplace. Finished hearth must NOT extend above this
level.
Continuous,
non-combustible sealant
Durock Tile, stone or other
non-combustible material
1 in. Micore and 1/2
in. Durock or
equivalent insulation
(see Table)
Floor constructed of wood or
other combustible material
Note: For installations
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clearance recommenda-
tions apply.
Figure 6.5 Standard Hearth Extension Construction
Vinyl Flooring
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Notice: Clearances that do not meet the minimum
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Protective
Metal Hearth
Strip
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* 2 in. (51 mm)
29