Heatilator BIR42 Owner's Manual page 43

Wood burning fireplace
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Non-combustible Sealant
Flush Hearth Extension
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.
Finished
30 in. Min.
Floor
Hearth Extension
1 in. (25.4 mm)
Micore and
Non-combustible Finishing Material
1/2 in. (13 mm)
Durock
Bottom of
Fireplace Opening
Protective Metal
Hearth Strip

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