Installation
900414-00 12/2015
Innovative Hearth Products
MHD 35/40 Series Direct-Vent Gas Fireplaces
20
6.
Rough in the Electrical Supply, if Needed
As necessary, rough in the fireplace electrical supply per NEC and local codes.
7.
Install the [Optional] Blower Kit before Installation in the Framing
1.
Remove the left side blower cover panel screw, and blower cover panel
(
Table 12
)
. Retain the panel and screw
for later reinstallation.
2.
Slide the blower through the opening and position it with the bracket oriented to the front of the firebox and the
blower discharge to the rear of the firebox. Bend the two tabs in the firebox floor to secure the blower to the
floor.
3.
Reinstall the blower cover panel and secure with the removed screw.
4.
Access the blower supply wiring through the front of the firebox and plug it into the junction box in the right, rear
of the firebox
(
Figure 35, Page 39
).
5.
Install the blower control switch according to its included instructions.
8.
Place the Fireplace in the Framing and Secure
NOTE:
Nailing flanges, combustible members, and screw heads in areas directly adjacent to the nailing flanges are
EXEMPT from the 1/2” clearance to combustible requirements for the firebox outer wrapper.
NOTE:
Combustible framing may be in direct contact with the nailing flanges and may be located within 1/2” of screw
heads and the firebox wrapper in areas adjacent to the nailing flanges.
Frame the opening to the exact dimensions specified in the framing details in this manual.
1.
Bend out the appropriate nailing flanges for the drywall / finish material to be used
(
Figure 10
)
. Nailing flanges
are provided for:
• flush framing,
• 1/2”, and
• 5/8” framing depths.
2.
Secure the fireplace to the side framing members using the unit’s nailing flanges —one top and bottom on each
side of the fireplace front
(
Figure 10
)
. Use 8d nails or the equivalent.
Figure 10 - Nailing Flanges
Side
framing
Unit nailing flange
(no clearance to combustible
framing is required)
VENT SYSTEM PREPARATION
9.
Select a Horizontal or Vertical Vent System
1.
With the fireplace secured in the framing, determine the vent route and identify the exterior termination location.
The following sections describe vertical (roof) and horizontal (exterior wall) vent applications. Use only approved
vent components
(
Page 8 and Pages 45 and 46
)
.
NOTE:
This fireplace must be vented directly to the outside.
WARNING
The vent system may not service multiple appliances, and must never be connected to a
flue serving a separate solid fuel burning appliance.
NOTE:
The vent pipe is tested to be run inside an enclosed wall (such as a chase). There is no requirement for
inspection openings in the enclosing wall at any of the joints in the vent pipe.
