Lennox EL180DFE Installation Instructions Manual page 12

WARNING
Asphyxiation hazard. The exhaust vent for this fur­
nace must be securely connected to the furnace flue
transition at all times.
VENT CONNECTION
FLUE TRANSITION
COLLAR
FIGURE 14
Common Venting Using Tile-Lined Interior Masonry Chimney and Combined Vent Connector
NOTE- Refer to provided venting
tables for installations.
"DISCONNECTED VENT"
WARNING
STICKER
MINIMUM LENGTH = AS SHORT AS PRACTICAL.
FOR MAXIMUM LENGTH SEE NOTE TO LEFT
OTHER
APPLIANCE
FURNACE
FIGURE 15
Page 12
Use self-drilling sheet metal screws or a mechanical fas­
tener to firmly secure the vent pipe to the round collar of the
flue transition. If self-drilling screws are used to attach the
vent pipe, it is recommended that three be used. Drive one
self-drilling screw through the front and one through each
side of the vent pipe and collar. See figure 14.
Install the first vent connector elbow at a minimum of six
inches (152 mm) from the furnace vent outlet.
Masonry chimneys used to vent Category I central fur­
naces must be either tile‐lined or lined with a listed metal
lining system or dedicated gas vent. Unlined masonry
chimneys are prohibited. See figures 15 and 16 for com­
mon venting.
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 encapsu­
lated fiberglass sleeve recommended by the flexible vent
pipe manufacturer. See figure 16.
VENT
CONNECTOR
PERMANENTLY
SEALED FIREPLACE
OPENING
INTERIOR TILE-LINED
MASONRY CHIMNEY
NOTE - the chimney must be properly
sized per provided venting tables or
lined with listed metal lining system.