Lennox SL280UH090V36B Installation Instructions Manual page 16

Common Venting Using Metal-Lined Masonry Chimney
MAX. LENGTH
-- SEE NOTE 1
BELOW.
5 ft. (1.5 m)
MIN. LENGTH -- AS
minimum
SHORT AS PRACTICAL
VENT CONNECTOR
4 in. (102 mm)
minimum
OTHER
APPLIANCE
NOTE 1 - Refer to the provided venting tables for installations. Refer
to the capacity requirements shown in the provided venting tables.
FIGURE 24
DO NOT insulate the space between the liner and
the chimney wall with puffed mica or any other loose
granular insulating material
Common Venting Using Tile-Lined Interior Masonry Chimney and Combined Vent Connector
NOTE- Refer to provided venting tables
for installations.
SEALED
EXTERIOR
CHIMNEY WITH
METAL
LINER
FURNACE
PERMANENTLY
SEALED FIREPLACE
OPENING
AIR FLOW
MINIMUM LENGTH = AS SHORT AS PRACTICAL.
FOR MAXIMUM LENGTH SEE NOTE TO LEFT
OTHER
APPLIANCE
SINGLE appliance venting of a fan-assisted furnace into
a tile-lined masonry chimney (interior or outside wall)
is PROHIBITED. The chimney must first be lined with
either type B1 vent or an insulated single wall flexible
vent lining system which has been sized according to the
provided venting tables and the vent pipe manufacturer's
instructions.
A fan-assisted furnace may be commonly vented into an
existing lined masonry chimney if the following conditions
are met:
• The chimney is currently serving at least one draft-
hood equipped appliance
• The vent connectors and chimney are sized accord-
ing to the provided venting tables.
If type B1 double-wall vent is used inside a chimney, no
other appliance can be vented into the chimney. The out-
er wall of type B1 vent pipe must not be exposed to flue
products.
VENT
CONNECTOR
FURNACE
AIR FLOW
FIGURE 25
Page 16
IMPORTANT
INTERIOR TILE-LINED
MASONRY CHIMNEY
NOTE - the chimney must be properly
sized per provided venting tables or
lined with listed metal lining system.
PERMANENTLY
SEALED FIREPLACE
OPENING