Lennox International Inc. MERIT PLUS MPB3530CNM-B - Manual (Page 10)

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NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
LENNOX HEARTH PRODUCTS • MERIT PLUS ® B-VENT GAS FIREPLACES (MPB33/35/40/45) • INSTALLATION INSTRUCTIONS
Use only approved venting
components. (see Approved Vent
Components on Page 2.)
These fi replaces must be vented vertically
to the outside.
Slip the fi rst section of B-Vent over the
fi replace fl ue outlet and secure with sheet
metal screws (# 8 or larger), then install
the remainder of the B-Vent vertically to the
outside. Minimum overall height of the vent
system and appliance must be 10' (2.54 m)
vertical with no offset, or 12' (3.7 m) when
an offset up to 45 degrees from the vertical is
used; or 15' (4.6 m) when an offset is greater
than 45 degrees and up to 60 degrees (see
Figure 13).
The offset may start at the fi replace fl ue
collar. The maximum overall height of the
vent system and appliance should not exceed
40 feet.
Install the B-vent system in accordance with
the vent manufacturer's instructions.
IMPORTANT: If propane is used, be aware
that if tank size is too small (i.e. under
100 lbs, if this is the only gas appliance
in the dwelling. Ref. NPFA 58), there
may be loss of pressure, resulting in
insuffi cient fuel delivery (which can result
in sooting, severe delayed ignition or other
malfunctions). Any damage resulting from
an improper installation, such as this, is
not covered under the limited warranty.
STEP 3. INSTALLING VENT SYSTEM
These instructions should be used as a
guideline and do not supersede local codes
in any way. Install venting according to
local codes, these instructions, the current
National Fuel Gas Code (ANSI-Z223.1) in
the USA or the current standards of CAN/
CGA-B149.1 in Canada.
Ensure clearances are in accordance
with local installation codes and the
requirements of the gas supplier.
Dégagement conforme aux codes
d'installa tion locaux et aux exigences du
foumisseunde gaz.
USE ONLY APPROVED B-VENT DIAMETER
MPB33, MPB35, MPB40 and MPB45 series
fi replaces must be vertically vented using
listed type-B, double-walled vent pipe with
the proper diameter as listed below and a
listed vent termination.
Required Pipe Diameter:
MPB33 series: Requires 4 in. (102 mm)
MPB35 series: Requires 5 in. (127 mm)
MPB40 series: Requires 5 in. (127 mm)
MPB45 series: Requires 6 in. (152 mm)
Figure 12: Initial B-Vent Installation
Type B-Vent - 4 in. (102 mm) for MPB33 Models,
5 in. (127 mm) for MPB35 / 40 Models or 6 in.
(152 mm) for MPB45 Models
Securing
Screws
Flue Outlet
Collar
Refer to the vent manufacturers installation
instructions for variations of venting techniques.
If common venting of several units is contem-
plated, it should be discussed with an architect
and the local Building Department.
Do not place insulation materials within 1 in.
of the gas vent system.
10 ft.
Minimum
Back View
Of Appliance
Vertical
Installations
Back View
Of Appliance
*12 ft. Min.
**15 ft. Min.
*with an offset up to 45 degrees
** with an offset greater than 45
degrees and up to 60 degrees
Offset
Installations
The maximum overall height of the vent system
and appliance should not exceed 40 feet.
Figure 13: Vent System Installation
CAUTION
This appliance cannot be vented
horizontally.