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Innovative Hearth Products
MHD 35/40 Series Direct-Vent Gas Fireplaces
MINIMUM CLEARANCES TO COMBUSTIBLES
Fireplace And Vent Clearances
The fireplace is approved with zero clearance to combustible materials on all sides (Table 8), with the following
exception: The unit may not be recessed (allowance made for mantel legs / side trim in Figure 5). When the unit is
installed with one side flush with a wall, the wall on the other side of the unit must not extend beyond the front edge
of the unit (Figure 5).
Table 8 - Minimum Clearances *
* 3" (77 mm) above any horizontal/inclined vent component.
** See Page 20 for clearance requirements to the nailing flange located at each side of the unit and any screw heads adjacent to it.
The fireplace must be mounted on a fully supported base extending the full width and depth of the unit. The fireplace
may be located on or near conventional construction materials. However, if installed on combustible materials, such
as carpeting, vinyl tile or other combustible material other than wood flooring, the appliance shall be installed on a
metal or wood panel extending the full width and depth of the appliance.
Hearth Extension
A hearth extension is not required with this fireplace. If a hearth extension is used, do not block the lower control
compartment door. Any hearth extension used is for appearance only and does not have to conform to standard
hearth extension installation requirements.
Shelf Height
To provide for the lowest possible shelf surface, use the rear vent model. For top vent models, the venting attached
to the top vent should be routed in a way to minimize obstructions to the space above the fireplace. Do not insulate
the space between the fireplace and the area above it (Tables 9 and 10). The minimum height from the base of the
fireplace to the underside of combustible materials used to construct a utility shelf in this fashion is shown in Table
9.
Table 9 - Combustible Shelf Height—Top Vent
35" Models
40" Models
*In alternative, Rear Vent applications, Top Vent will be sealed as detailed in Installation
Sequence Step 3.5.
14
From Bottom of Unit to Ceiling
Front Service Clearance—
clearance immediately in front of viewing area(s)
Top Vent with one 90° Elbow
Model
Secure Vent
®
47" (1194 mm)
52" (1321 mm)
1" (26mm) to wrapper
Back
0" (0 mm) to Spacers
1/2" (13 mm) to wrapper
Sides
0" (0 mm) to Spacers **
Top Standoffs
0" (0 mm) to top standoffs
Floor
0" (0 mm)
64" (1626 mm)
3" (77 mm)—Top *
Vent
1" (26 mm)—Sides and Bottom
36" (914 mm)
Alternative Rear Vent
applications*
Secure Flex
®
Secure Vent
(flex elbow)
49" (1245 mm)
41" (1042 mm)
54" (1372 mm)
46" (1169 mm)
®
Shelf Height
(see table)
General Information
900414-00 12/2015
*
No com-
bustibles or
insulation
in the
shaded area
between the
appliance
and the
shelf above
it.
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