8
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
LENNOX HEARTH PRODUCTS • MERIT PLUS
®
DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS
12 (305) MANTEL
10 (254) MANTEL
8 (203) MANTEL
6 (152) MANTEL
4 (102) MANTEL
4
(102)
14
(356)
12
(305)
10
(254)
2 (51) MANTEL
TOP OF
APPLIANCE
6
(152)
NOTE - Hood shown as positioned in louvered
front model. The hood position in the flush
faced front model is lower than shown.
8
(203)
MANTEL CLEARANCES
Inches (mm)
Figure 9 - Minimum Mantel Clearances
Figure 10 - Minimum Distance to Side Wall
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
)
.
MINIMUM CLEARANCES
*
Inches (millimeters)
Back
1/2 (13)
0 (0) from Spacers or dimples
Sides
1/2 (13)
0 (0) from Spacers or dimples **
Top of Fireplace
3 (76)
0" (0 mm) with standoff(s) in vertical
position (see
Figure 11
)
Floor
0 (0)
From Bottom of Unit To Ceiling
64 (1626)
Vent
3 (76) Top* / 1 (25.4) Sides & Bottom
SERVICE CLEARANCES Feet (meters)
Front
3 feet (0.9 meters)
Table 5
Figure 8 - Shelf Height Minimum Clearances
Shelf Above Fireplace With Rear Venting
Shelf Above Fireplace With Top Venting
Shelf Height
(see table)
Shelf Height
(see table)
do not insulate the
space between the ap-
pliance and the area
above it.
do not insulate the
space between the
appliance and the area
above it.
*NOTE: 3" (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.
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
.
Wall Finishes / Surrounds / Mantels
NOTE:
Combustible wall finish materials and/or surround materials must not
be allowed to encroach the area defined by the appliance front face (black
sheet metal).
Never allow combustible materials to be positioned in front
of or overlapping the appliance face
(see
Figures 61 and 62
on
Page 34)
.
Non-combustible materials, such as surrounds and other appliance trim,
may be installed on the appliance face with these exceptions: they must not
cover any portion of the removable glass panel or control compartment.
Vertical installation clearances to combustible mantels vary according
to the depth of the mantel. See
Figure 9
. Mantels constructed of non-
combustible materials may be installed at any height above the appliance
opening; however, do not allow anything to hang below the fireplace hood.
Minimum clearance requirements include any projections such as shelves,
window sills, mantels, etc. above the appliance.
NOTE:
We recommend the use of high temperature paint (rated 175° F
or higher) on the underside of the mantel.
3-1/2
(89)
6
(152)
Top View of
Fireplace
45
o
Inches (millimeters)
Combustible materials may
project beyond either side
of the fireplace opening
as long as they are kept
within the shaded area
illustrated here.
Combustible Materials
Allowed In Shaded Area
“Safe Zone”
Combustible Walls
shown in dark gray
At 6" minimum
side wall clearance,
a combustible wall
can project to any
length.
Inches (millimeters)
Models
Combustible Shelf Height - inches (millimeters)
Top Vent - with One 90 degree Elbow
Rear Vent - Straight Out The Back
Secure Vent
®
Secure Flex
®
Secure Vent
Secure Flex
MPdT33
MPdR33
43-3/4 (1111)
45-1/2 (1156)
33-1/4 (845)
33-1/4 (845)
MPd35
45-3/4 (1162)
47-1/2 (1207)
35-1/4 (895)
35-1/4 (895)
MPd40
MPd45
50-3/4 (1289)
52-1/2 (1334)
40-1/4 (1022)
40-1/4 (1022)
