Step 3. Install The Venting System - Lennox MPB3328CNM-B Installation Instructions Manual

Merit plus series mpb b-vent gas fireplaces
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Step 3. INSTALL THE VENT SYSTEm &
EXTERIOR TERmINATION:
General Information
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/CSA-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'installation
locaux et aux exigences du foumisseunde
gaz.
Use only approved venting components.
See Approved Vent Components on
Page 2.
These fireplaces must be vented directly
to the outside.
Slip the first section of B-Vent over the fireplace
flue outlet and secure with four sheetmetal
screws (# 8 or larger), and install the remainder
of the B-Vent to the outside. Minimum overall
height of the vent system and appliance must
be 10' (2.54 m) vertical - no offset (see Figure
13); 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.
The offset may start at the fireplace flue collar
(see Figure 13). 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.
Type b-Vent - 4 in. (102 mm) for mpb 3328 models,
5 in. (127 mm) for mpb 3530 / 4035 models or 6 in.
(153 mm) for mpb 4540 models
Figure 12
12
The maximum overall height of the vent system
and appliance should not exceed 40 feet.
Figure 13
USE ONLY AppROVEd b-VENT dIAmETER
mpb-3328, mpb-3530, mpb-4035 and mpb-
4540 series fireplaces 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:
mpb-3328 series: Requires 4 in. (102 mm)
mpb-3530 series: Requires 5 in. (127 mm)
mpb-4035 series: Requires 5 in. (127 mm)
mpb-4540 series: Requires 6 in. (152 mm)
Securing
Screws
Flue Outlet
Collar
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Vertical
Installations
back View
back View
Of Appliance
Of Appliance
This appliance cannot be vented
horizontally.
Note: Refer to the vent manufacturers instal-
lation instructions for variations of venting
techniques. If common venting of several units
is contemplated, 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.
Offset
Installations
back View
back View
Of Appliance
Of Appliance
CAUTION

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