Minimum Clearance To Combustibles - Lennox Merit MLDVTCD-35NM Installation Instructions Manual

LENNOX HEARTH PRODUCTS • MERIT
MINIMUM CLEARANCE TO
COMBUSTIBLES
The appliance is approved with zero
clearance to combustible materials on
all sides (Table 7), 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 (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 (Table 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
Table 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.
Table 7: Minimum Clearances *
1/2 in. (13 mm)
Back
0 in. (0 mm) from Spacers or Dimples
1/2 in. (13 mm)
Sides
0 in. (0 mm) from Spacers or Dimples **
3 in. (76 mm)
Top of
0 in. (0 mm) with standoff(s) in vertical
Fireplace
position (Figure 10)
Floor 0 in. (0 mm)
From
Bottom
minimum of 64 in. (1626 mm)
of Unit To
Ceiling
3 in. (76 mm)—Top *
Vent
1 in. (25.4 mm)—Sides and Bottom
Front
36 in. (914 mm)
Service
* Note: 3 in. (75 mm) above any horizontal/
inclined vent component.
** Note: See Frame the Fireplace on Page 9
for clearance requirements to the nailing flange
located at each side of the unit and any screw heads
adjacent to it.
8
SERIES DIRECT-VENT GAS FIREPLACES • MLDVTCD-35 • INSTALLATION INSTRUCTIONS
®
Table 8: Shelf Height Minimum Clearances
Model
MLDVTCD-35
Wall Finishes, Surrounds,
and 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 (Figure 35 on Page 30).
Non-combustible materials, such as
surrounds and other appliance trim,
may be installed on the appliance face,
but 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 (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.
DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Do not insulate the
space between the
appliance and the
area above it.
Shelf Height
(see table)
Top Vent—with One 90° Elbow
Secure Vent
46 1/2 in. (1181 mm)
Figure 8: Minimum Mantel Clearances
18 (457)
16 (406)
14 (356)
12 (305)
10 (254)
8 (203)
12 10
(305) (254)
Figure 9: Minimum Distance to
Side Wall
At 6 in. minimum
side wall clearance,
a combustible wall
can project to any
length.
o
45
6 in.
(152 mm)
Secure Flex
48 1/4 in. (1226 mm)
Mantel
Depth
inches (millimeters)
Header
Top of
Appliance
Hood
8 6 4 2
(203) (152) (102) (51)
Top View of
Fireplace
Combustible Materials
Allowed In Shaded Area
3 1/2 in.
"Safe Zone"
(89 mm)
Combustible Walls
shown in dark gray
Combustible mantel legs may
project beyond either side
of the fireplace opening
as long as they are kept
within the shaded area
illustrated here.