Fireplace Installed Flush On The Floor And Hearth Extension Raised To Bottom Of Firebox Opening - Heatilator CL36D Installation Manual

1. Fireplace Installed Flush on the Floor and
Hearth Extension Raised to Bottom of Firebox
Opening
Non-combustible flooring a minimum of 20 in. (508 mm)
in front of and 12 in. (305 mm) to each side of the fuel
opening is required.
The hearth framing must be constructed of non-com-
bustible materials (such as metal framing or equivalent
material) and placed on HX3(s), HX4(s), or equivalent
material.
When creating the platform, allow for the thickness
of the non-combustible finishing materials.
Seal gaps between the hearth extension and the front
of the fireplace with a bead of non-combustible sealant
or grout.
Note: Maximum height from floor under fireplace
to top of finished hearth extension is 5 7/8 in.
Bottom of fireplace opening
Continuous,
non-combustible sealant
Tile, stone or other
non-combustible material
1/2 in. Micore
or equivalent
insulation
Floor constructed of wood or
other combustible material
Figure 7.4 Hearth Extension Construction
2 in. (51 mm)
required
Heatilator • CL36D, CR36D Installation Manual • 4012-046 • Rev D • 10/03/13
Note: The bottom of the fireplace
opening is 5 7/8 in. (149 mm)
above the bottom of the
fireplace. Finished hearth must
NOT extend above this level.
Noncombustible
Finishing Material
Noncombustible
Framing Material
1/2 in. Micore
or equivalent
insulation
Figure 7.5
Protective
Metal Hearth
Strip
Noncombustible
Framing Material
Figure 7.6
Non-combustible
Finishing Materials
Figure 7.7
20 in. Min.
Hearth Extension
Protective Metal
Hearth Strips
Raised Platform Hearth Extension Detail
Raised Platform Hearth Extension-Framing
Raised Platform Hearth Extension-Finishing
Floor
HX4 or
equivalent
29