Lennox EL180UHE Installation Instructions Manual page 15

VENT PIPE
(min. 6" length)
FLUE TRANSITION
COLLAR
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 23
WARNING
Asphyxiation hazard. The exhaust vent for this furnace
must be securely connected to the furnace flue
transition at all times..
DO NOT insulate the space between the liner and the
chimney wall with puffed mica or any other loose granular
insulating material.
VENT CONNECTION UPFLOW AND HORIZONTAL POSITION
"DISCONNECTED VENT"
WARNING
STICKER
SEALED
EXTERIOR
CHIMNEY WITH
METAL
FURNACE
PERMANENTLY
SEALED FIREPLACE
OPENING
AIR FLOW
"DISCONNECTED VENT"
WARNING
STICKER
Figure 22
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
LINER 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 drafthood-
equipped appliance;
• The vent connectors and chimney are sized according
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 outer
wall of type B1 vent pipe must not be exposed to flue prod-
ucts. A type B1 vent or masonry chimney liner shall termi-
nate above the roof surface with a listed cap or a listed
roof assembly according to the terms of their respective
listings and the vent manufacturer's instructions.
When inspection reveals that an existing chimney is not
safe for the intended purpose, it shall be rebuilt to conform
to nationally recognized standards, lined or relined with
suitable materials, or replaced with a gas vent or chimney
suitable for venting EL180UHE series units. The chimney
passageway must be checked periodically to ensure that
it is clear and free of obstructions.
Page 15
VENT PIPE
(min. 6" length)
IMPORTANT
FLUE
TRANSITION
COLLAR