Heatilator Birmingham BIR42-B Installation Manual page 28

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If Mortar is applied, it should be applied after
finishing material is installed. Mortar will be
applied between finishing materials and
molded brick edges, bottom and sides.
The seam between finishing materials and
firebox top must be sealed with non-
combustible sealant.
Figure 7.3 Facing Materials and Mortar
 Heatilator • Birmingham 42-B Installation Manual • 4059-715 • Rev AD • 06/23
The surface of the finished hearth extension and
the surface of the hearth panel should be level.
The noncombustible finishing
material across the top of
fireplace opening will be even
with lower edge of metal face.
Noncombustible finishing
materials MUST overlap
side faces by 1 1/4 in. (32 mm)
to cover the edges of the
panels. Finished opening
should be 42 x 38 in. (1067 x
965 mm) to allow for door
installation.