506303-01
Page 8 of 40 Issue 0938
Concentric Vent Kit
A concentric vent kit (see Accessories section on page 34 for
correct kit) is available for use when installing this furnace as
a direct vent furnace and the air intake and vent pipe are to
be run through the same hole, whether horizontally through
the wall or vertically through the roof (see Figure 3). Refer to
the instructions included with the concentric vent kit for
installation specifics.
Vent Pipe Size and Length
The vent pipe and air intake pipe (in direct vent installations)
should be sized in accordance with the information found
in the appropriate table in Figure 4. One 90° elbow is
equivalent to 5' of pipe. Two 45° elbows are equivalent to
one 90° elbow. The minimum length certified for use with
this furnace is 5' and one elbow, not including the vent and
air intake terminals.
In the event that the pipe length is in between the lengths
listed in the table, use the next larger length listed. For
example, if a length of pipe needed to install the furnace is
27', use the diameter values for the 30' row in the tables.
For direct vent installations, if the vent and air intake pipe
are not equal in length and number of elbows, then
determine the minimum pipe diameter for both the vent and
air intake. If the results indicate different diameters, use
the larger of the two for both the vent and air intake. Under
no circumstances should the vent and air intake pipe
size be different in diameter. For installation details, refer
to the appropriate section in pages 11 – 15 for the unit model
and type of installation.
High Altitude Installation: 2” pipe not recommended at
altitude above 4,000 feet. 3” pipe required for altitude above
5,000 feet.
Horizontal Venting
The vent for this appliance shall not terminate over public
walkways; or near soffit vents or crawl space vents or other
areas where condensate or vapor could create a nuisance
or hazard or cause property damage; or where condensate
vapor could cause damage or could be detrimental to the
operation of regulators, relief valves, or other equipment.
See Figures 5 and 6 on pages 9 and 10 for additional
information on where the horizontal vent terminal can and
cannot terminate.
For Masschusetts Installations: The installation must
comply with Massachusetts
248 CMR 5.08 Modifications
to sections of NFPA-54, Chapter 10. (See pages 39 and
40)
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