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Common Venting Using Tile lined Interior Masonry Chimney and Combined Vent Connector
NOTE: Refer to provided venting
tables for installations.
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 16 and 17 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 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.
Common Venting Using Metal
Lined Masonry Chimney
NOTE 1: Refer to the provided venting tables for installations.
506892-01
Figure 17
Figure 16
Insulation for the flexible vent pipe must be an encapsulated
fiberglass sleeve recommended by the flexible vent pipe
manufacturer.
DO NOT insulate the space between the liner and the
chimney wall with puffed mica or any other loose
granular insulating material.
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 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
products. A type B1 vent or masonry chimney liner shall
terminate 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 units. The chimney passageway must be checked
periodically to ensure that it is clear and free of obstructions.
Do not install a manual damper, barometric draft regulator,
or flue restrictor between the furnace and the chimney.
Issue 1251
NOTE: The chimney must be properly sized
per provided venting tables or lined with
listed metal lining system.
IMPORTANT
Page 13 of 64
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