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).
MINIMUM CLEARANCES
Back
Sides
Top of Fireplace
Floor
From Bottom of Unit To Ceiling
Vent
SERVICE CLEARANCES Feet (meters)
Front
Table 5
*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.
8
DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS
®
*
Inches (millimeters)
1/2 (13)
0 (0) from Spacers or dimples
1/2 (13)
0 (0) from Spacers or dimples **
3 (76)
0" (0 mm) with standoff(s) in vertical
position (see Figure 11)
0 (0)
64 (1626)
3 (76) Top* / 1 (25.4) Sides & Bottom
3 feet (0.9 meters)
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Combustible Shelf Height - inches (millimeters)
Models
Top Vent - with One 90 degree Elbow
®
Secure Vent Secure Flex
MPdT33
43-3/4 (1111) 45-1/2 (1156)
MPdR33
MPd35 45-3/4 (1162) 47-1/2 (1207)
MPd40
50-3/4 (1289) 52-1/2 (1334)
MPd45
do not insulate the
space between the
appliance and the area
above it.
Shelf Height
(see table)
Shelf Above Fireplace With Rear Venting
Figure 8 - Shelf Height Minimum Clearances
MANTEL CLEARANCES
Inches (mm)
12 (305) MANTEL
10 (254) MANTEL
8 (203) MANTEL
14
(356)
12
(305)
10
(254)
8
(203)
6
(152)
4
(102)
NOTE - Hood shown as positioned in louvered
front model. The hood position in the flush
faced front model is lower than shown.
Figure 9 - Minimum Mantel Clearances
At 6" minimum
side wall clearance,
a combustible wall
can project to any
length.
o
45
3-1/2
6
(152)
Figure 10 - Minimum Distance to Side Wall
Rear Vent - Straight Out The Back
®
Secure Vent Secure Flex
33-1/4 (845) 33-1/4 (845)
35-1/4 (895) 35-1/4 (895)
40-1/4 (1022) 40-1/4 (1022)
do not insulate the
space between the ap-
pliance and the area
above it.
Shelf Height
(see table)
Shelf Above Fireplace With Top Venting
Inches (millimeters)
6 (152) MANTEL
4 (102) MANTEL
TOP OF
2 (51) MANTEL
APPLIANCE
Top View of
Fireplace
Combustible Materials
Allowed In Shaded Area
(89)
"Safe Zone"
Combustible Walls
shown in dark gray
Combustible materials may
project beyond either side
of the fireplace opening
as long as they are kept
within the shaded area
illustrated here.
Inches (millimeters)