Fireplace Installed Flush On The Floor - Heatilator A36C Installation Manual

1. Fireplace Installed Flush on the Floor

Non-combustible flooring a minimum of 16 in. (406
mm) in front of and 8 in. (203 mm) to each side of the
fuel opening is required (A36).
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 (A42).
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. See Figures 7.4 and 7.5.
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 2 in. (51 mm).
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
Heatilator • A36/42C, A36/42CH • Installers Manual • 4017-262 • Rev D • 10/07/13
Protective
Metal Hearth
Strip
2 in. (51 mm)
required
Note: Maximum height from floor
under fireplace to top of finished
hearth extension is 2 in. (51 mm).
Noncombustible
Finishing Material
Hearth Extension
Noncombustible
Framing Material
1/2 in. Micore
or equivalent
insulation
Figure 7.5 Hearth Extension Detail
16 in. (A36)
20 in. (A42) Min.
Floor
Protective Metal
Hearth Strips
29