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The EL280UH series units are classied as fan-assisted
Category I furnaces when vertically vented according to
the latest edition of National Fuel Gas Code (NFPA 54 /
ANSI Z223.1) in the USA. A fan-assisted Category I fur-
nace is an appliance equipped with an integral mechan-
ical means to either draw or force combustion products
through the combustion chamber and/or heat exchang-
er. The EL280UH is not approved for use with horizontal
venting.
NOTE - Use these instructions as a guide. They do not
supersede local codes. This furnace must be vented ac-
cording to all local codes these installation instructions,
and the provided venting tables in these instructions
The venting tables in this manual were extracted from the
National Fuel Gas Code (NFPA 54 / ANSI Z223.1) and are
provided as a guide for proper vent installation. Proper
application, termination, construction and location of vents
must conform to local codes having jurisdiction. In the ab-
sence of local codes, the NFGC serves as the dening
document.
Refer to the tables and the venting information contained
in these instructions to properly size and install the venting
system.
Use self-drilling sheet metal screws or a mechanical fas-
tener to rmly secure the vent pipe to the round collar of
the ue 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 gure 22.
Install the rst vent connector elbow at a minimum of six
inches (152 mm) from the furnace vent outlet. See gure
22.
Venting Using a Masonry Chimney
The following additional requirements apply when a lined
masonry chimney is used to vent this furnace.Masonry
chimneys used to vent Category I central furnaces must
be either tile-lined or lined with a listed metal lining sys-
tem or dedicated gas vent. Unlined masonry chimneys are
prohibited. See gures 23 and 24 for common venting.
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 exible metal vent.
An exterior tile-lined chimney that is sealed and capped
may be lined with a listed uninsulated exible metal vent.
If the existing chimney will not accommodate a listed met-
al liner, either the chimney must be rebuilt to accommo-
date one of these liners or an alternate approved venting
method must be found.
Insulation for the exible vent pipe must be an encapsulat-
ed berglass sleeve recommende
IMPORTANT
Once the venting system is installed, attach the
“Disconnected Vent” warning sticker to a visible area
of the plenum near the vent pipe. See gure 22. The
warning sticker is provided in the bag assembly. Order
kit 66W04 for additional stickers..
WARNING
Asphyxiation hazard. The exhaust vent for this furnace
must be securely connected to the furnace uetransition
at all times.
FLUE TRANSITION
COLLAR
VENT PIPE
(min. 6” length)
“DISCONNECTED VENT”
WARNING
STICKER
FLUE
TRANSITION
COLLAR
VENT CONNECTION UPFLOW AND HORIZONTAL POSITION
VENT PIPE
(min. 6” length)
“DISCONNECTED VENT”
WARNING
STICKER
FIGURE 22
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