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Figure 16. Vent Connection
Use self drilling sheet metal screws or a mechanical
fastener 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 16.
Install the first vent connector elbow at a minimum of six
inches (152 mm) from the furnace vent outlet. See Figure
16.
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
system or dedicated gas vent. Unlined masonry chimneys
are prohibited. See Figures 17 and 18 for common venting.
A chimney with one or more sides exposed to the outside
of the structure is considered to be an exterior chimney.
NOTE: Refer to provided venting
tables for installations.
Figure 18. Common Venting Using Tile Lined Interior Masonry Chimney and Combined Vent Connector
507327-01
An exterior masonry chimney that is not tile lined must be
lined with B 1 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
method must be found.
Insulation for the flexible vent pipe must be an encapsulated
fiberglass sleeve recommended by the flexible vent pipe
manufacturer.
NOTE 1: Refer to the provided venting tables for installations.
Refer to the capacity requirements shown in the provided venting
tables.
Figure 17. Common Venting Using Metal Lined
DO NOT insulate the space between the liner and the
chimney wall with puffed mica or any other loose granular
insulating material.
Issue 1809
Masonry Chimney
NOTE: The chimney must be properly
sized per provided venting tables or
lined with listed metal lining system.
Page 13 of 34
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