Protective Metal Hearth Strips; Outside Air Kit - Heatilator ST36D Installation Manual

F. Protective Metal Hearth Strips
WARNING! Risk of Fire!
strips MUST be installed on combustible surfaces. DO
NOT cover metal strips with combustible materials.
Sparks or embers may ignite flooring.
WARNING! Risk of fire!
embers or other burning material falling from the
fireplace may ignite flooring or concealed combustible
surfaces.
• Protective metal hearth strips MUST be installed.
• Hearth extensions MUST be installed exactly as
specified.
• Locate the two protective metal hearth strips measuring
approximately 26 in. x 4 in. (660 mm x 102 mm) included
with this fireplace.
• Slide each metal strip 2 in. (51 mm) under front edge of
fireplace.
• Overlap strips in the middle of fireplace opening by 1 in.
(25 mm) minimum.
• Metal strips must extend beyond the front and sides
of the fireplace opening by at least 2 in. (51 mm),
Figure 3.6).
• Protect the front of a platform elevated above the hearth
extension with metal strips (not included with fireplace)
per Figure 3.6. See
instructions.
G. Outside Air Kit
►
When you install the outside air kit, Hearth & Home Tech-
nologies recommends you utilize the shortest duct run to
optimize the performance of the outside air kit and install
a P-trap (see Figure 3.10). The outside air inlet hood
should be positioned in a manner that will not allow snow,
leaves, etc. to block the inlet. In some installations the air
duct may need to be run vertically. In such an installation,
a 3 ft (914 mm) height difference must be maintained from
the top of the uppermost chimney section to the outside
air inlet hood.
NOTE: The maximum length of a 4 inch diameter duct is
20 feet. The duct can be extended up to a maximum of 40
feet by using 6 inch duct. A 4 inch to 6 inch adapter will be
needed. (not included).
NOTE: The minimum cross-sectional area of the 4 inch
inlet hood is 7.0 square inches.
Refer to Figures 3.8 and 3.9 when placing the outside air
inlet hood.
CAUTION! Risk of Fire or Asphyxiation! DO NOT draw
outside combustion air from wall, floor or ceiling cavity, or
enclosed spaces such as an attic or garage.
• DO NOT place outside air inlet hood close to exhaust
vents or chimneys. Fumes or odor could be drawn into
the room through the fireplace.
• Locate outside air inlet hood to prevent blockage from
leaves, snow/ice, or other debris. Blockages could cause
combustion air starvation.
Protective metal hearth
High temperatures, sparks,
Section 7 for hearth extension
Heatilator • ST36D Installation Manual • 4012-061 • Rev M • 08/20
1 in. (25 mm)
overlap
Protective metal strips are placed 2 in. (51 mm) under the
front of the fireplace and must extend beyond the front
and sides of fireplace opening by 2 in. (51 mm).
Figure 3.6 Position the Protective Metal Hearth Strips
Top piece must overlap
bottom piece
Raised Platform
2 in.
(51 mm)
2 in.
(51 mm)
Figure 3.7 Protect the Front of an Elevated Platform
3 ft min. from
top of uppermost
chimney section
to air inlet.
Figure 3.8 Outside Air Inlet Locations
Place unit, then ou
with white. Move b
and group/ Delete
1 in. (25 mm) min.
overlap
Floor
Note: Chimney air kit is
not shown, but is required
in Canada.
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