International comfort products N8MXL Installation Instructions Manual page 25

be required for some model furnaces. A field−supplied
4−inch−to−5−inch (101 − 127 mm) or 4−inch−to−6−inch (101
− 152 mm) sheet metal increaser fitting is required when
5−inch (127 mm) or 6−inch (152 mm) vent connector is used.
See Figure 28 − Figure 40 Venting Orientation for approved
vent configurations.
NOTE: Vent connector length for connector sizing starts at
furnace vent elbow. The 4−inch vent elbow is shipped for
upflow configuration and may be rotated for other positions.
Remove the 3 screws that secure vent elbow to furnace,
rotate furnace vent elbow to position desired, reinstall screws.
The factory−supplied vent elbow does NOT count as part of
the number of vent connector elbows.
The vent connector can exit the furnace through one of 5
locations on the casing.
1. Attach the single wall vent connector to the furnace
vent elbow, and fasten the vent connector to the vent
elbow with at least two field−supplied, corrosion−resist-
ant, sheet metal screws located 180_ apart.
NOTE: A flue extension is recommended to extend from the
furnace elbow to outside the furnace casing. If flue extension
is used, fasten the flue extension to the vent elbow with at
least two field−supplied, corrosion−resistant, sheet metal
441 01 1421 01
screws located 180_ apart. Fasten the vent connector to the
flue extension with at least two field−supplied, corrosion
resistant sheet metal screws located 180_ apart.
2. Vent the furnace with the appropriate connector as
shown in Figure 28 − Figure 40.
3. Determine the correct location of the knockout to be re-
moved.
4. Use a hammer and screwdriver to strike a sharp blow
between the tie points and work the slug back and forth
until the slug breaks free.
CUT HAZARD
Failure to follow this caution may result in personal
injury.
Sheet metal parts may have sharp edges or burrs.
Use care and wear appropriate protective clothing,
safety glasses and gloves when handling parts and
servicing furnaces.
Specifications are subject to change without notice.
CAUTION
!
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