Heatilator A36C - Raised Hearth Extension and Raised Fireplace

Heatilator • A36/42C, A36/42CH • Installers Manual • 4017-262 • Rev D • 10/07/13
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2. Raised Hearth Extension and Raised Fire-
place
Non-combustibleooring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ooring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)021.
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Figure7.8.
When creating the platform, allow for the thickness
ofthenon-combustiblenishingmaterials.
Sealgapsbetweenthehearthextensionandthefront
ofthereplacewithabeadofnon-combustiblesealant
orgrout.
Platform must be built
to raise the fireplace
for the desired hearth
height.
Protective Metal
Hearth Strips
Floor and platform constructed of
wood or other combustible material
Continuous,
non-combustible sealant
Tile, stone or other
non-combustible finishing
material
Non-combustible
Framing Material
16 in. (A36) or 20 in. (A42)
minimum Hearth Extension
1/2 in. Micore
or equivalent
insulation
Note: Maximum height from floor
under fireplace to top of finished
hearth extension is 2 in. (51 mm).
Figure 7.8 Raised Hearth Extension and Fireplace Framing Materials