8
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
LENNOX HEARTH PRODUCTS • MERIT PLUS
®
DIRECT VENT GAS FIREPLACES (MPDP35/40) • INSTALLATION INSTRUCTIONS
Figure 8: Minimum Mantel Clearances
Figure 9: 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).
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 4 (102)
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
12 (305) MANTEL
10 (254) MANTEL
8 (203) MANTEL
6 (152) MANTEL
4 (102) MANTEL
6
(152)
16
(406)
14
(356)
12
(305)
2 (51) MANTEL
TOP OF
APPLIANCE
8
(203)
10
(254)
MANTEL CLEARANCES
Inches (mm)
NOTE: Hood shown.
Models
Combustible Shelf Height - inches (millimeters)
Top Vent with 1-foot section
and one 90-degree elbow
Rear Vent
(straight out the back)
Secure Vent
®
Secure Flex
®
Secure Vent Secure Flex
MPDP35
55-7/8 (1419) 57-5/8 (1464) 36-1/4 (921) 36-1/4 (921)
MPDP40
60-7/8 (1546) 62-5/8 (1591) 41-1/4 (1048) 41-1/4 (1048)
Figure 7:
Shelf Height Minimum Clearances
Min. 1 ft.
section
required.
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 in. (75 mm) above any horizontal/inclined vent component.
**Note: See Page 9, 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 7). 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 7.
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 Figure 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 8. 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)
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