Lennox DAVE SIGNATURE SL280DFV Installation Instructions Manual page 13

Common Venting Using Tile-Lined Interior Masonry Chimney and Combined Vent Connector
NOTE- Refer to provided venting tables
for installations.
VENT CONNECTION UPFLOW
AND HORIZONTAL POSITION
VENT PIPE
(min. 6" length)
FLUE TRANSITION
COLLAR
"DISCONNECTED VENT"
WARNING
STICKER
VENT PIPE
(min. 6" length)
FIGURE 15
Venting Using a Masonry Chimney
The following additional requirements apply when a lined
masonry chimney is used to vent this furnace.
A chimney with one or more sides exposed to the outside
of the structure is considered to be an exterior chimney.
An exterior masonry chimney that is not tile-lined must be
lined with B1 vent or a listed insulated flexible metal vent.
An exterior tile-lined chimney that is sealed and capped
may be lined with a listed uninsulated flexible metal vent.
If the existing chimney will not accommodate a listed metal
liner, either the chimney must be rebuilt to accommodate
one of these liners or an alternate approved venting meth-
od must be found. Insulation for the flexible vent pipe must
be an encapsulated fiberglass sleeve recommended by
the flexible vent pipe manufacturer. See FIGURE 16.
MINIMUM LENGTH = AS SHORT AS PRACTICAL.
FOR MAXIMUM LENGTH SEE NOTE TO LEFT
OTHER
APPLIANCE
AIR FLOW
"DISCONNECTED VENT"
WARNING
STICKER
FLUE
TRANSITION
COLLAR
VENT
CONNECTOR
FURNACE
FIGURE 14
Common Venting Using Metal-Lined Masonry Chimney
5 ft. (1.5 m)
minimum
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.
DO NOT insulate the space between the liner and
the chimney wall with puffed mica or any other loose
granular insulating material
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.
Page 13
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
MAX. LENGTH
-- SEE NOTE 1
BELOW.
MIN. LENGTH -- AS
SHORT AS PRACTICAL
FURNACE
SEALED FIREPLACE
AIR FLOW
FIGURE 16
IMPORTANT
SEALED
EXTERIOR
CHIMNEY WITH
METAL
LINER
PERMANENTLY
OPENING