Appliance And Vent Clearances - Lennox MPDT33RNM Installation Instructions Manual

LENNOX HEARTH PRODUCTS • MERIT PLUS
MINIMUM CLEARANCES TO COMBUSTIBLES

Appliance And Vent Clearances

The appliance is approved with zero clearance to combustible
materials on all sides (as detailed in Table 5), with the following
exception: 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. In addition, when the unit is recessed, the side
walls surrounding the unit must not extend beyond the front edge of
the unit (see Figure 3).
Hearth Extension
—A hearth extension is not required with this
appliance. 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 alternate rear vent outlet, the venting attached to the top vent
should be routed in a way to minimize obstructions to the space above
the appliance. Do not insulate the space between the appliance and
the area above it (see Figure 8). The minimum height from the base
of the appliance to the underside of combustible materials used to
construct a utility shelf in this fashion is shown in Figure 8.
The appliance should be mounted on a fully supported base extending
the full width and depth of the unit. The appliance may be located on
or near conventional construction materials. However, if installed on
combustible materials, such as carpeting, vinyl tile, etc., a metal or
wood barrier covering the entire bottom surface must be used.
Figure 8: Shelf Height Minimum Clearances
8
DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS
®
Combustible Shelf Height—in. (mm)
Models
Top Vent—with One 90 Degree Elbow
Secure Vent
MPDT33
43 3/4 (1111)
MPDR33
MPD35 45 3/4 (1162)
MPD40
50 3/4 (1289)
MPD45
Do not insulate the
space between the
appliance and the area
above it.
Shelf Height
(see table)
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Back
Sides
Top of Fireplace
Floor
From Bottom of Unit To Ceiling
Vent
SERVICE CLEARANCES
Front
Table 5: Minimum Clearances*
*Note: 3 in. (75 mm) above any horizontal/inclined vent component.
**Note: See Page 10, Step 1 for clearance requirements to the nailing
flange located at each side of the unit and any screw heads adjacent to it.
Rear Vent—Straight Out The Back
Secure Flex Secure Vent
45 1/2 (1156) 33 1/4 (845)
47 1/2 (1207) 35 1/4 (895)
52 1/2 (1334) 40 1/4 (1022)
Do not insulate the
space between the
appliance and the
area above it.
Shelf Height
(see table)
1/2 in. (13 mm)
0 in. (0 mm) from Spacers Or
Dimples
1/2 in. (13 mm)
0 in. (0 mm) from Spacers Or
Dimples **
3 in. (76 mm)
0 in. (0 mm) with standoff(s) in
vertical position (see Figure 11)
0 in. (0 mm)
minimum of 64 in. (1626)
3 in. (76 mm) * / 1 in. (25.4 mm)
Top
Sides & Bottom
Feet (meters)
3 ft (0.9 m)
Secure Flex
33 1/4 (845)
35 1/4 (895)
40 1/4 (1022)