Allied Air A80UH1E Installation Instructions Manual page 15

Common Venting Using Tile Lined Interior Masonry Chimney and Combined Vent Connector
NOTE: Refer to provided venting
tables for installations.
DO NOT insulate the space between the liner and the
chimney wall with puffed mica or any other loose granular
insulating material.
IMPORTANT
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. The chimney passageway must be
checked periodically to ensure that it is clear and free of
obstructions.
507330-01
Figure 25
Do not install a manual damper, barometric draft regulator,
or flue restrictor between the furnace and the chimney.
Never connect a Category I appliance to a chimney that is
servicing a solid fuel appliance. If a fireplace chimney flue
is used to vent this appliance, the fireplace opening must
be permanently sealed.
A type B1 or listed chimney lining system that passes
through an unused masonry chimney flue is not considered
to be exposed to the outdoors.
General Venting Requirements
Vent all furnaces according to these instructions:
1. Vent diameter recommendations and maximum
allowable piping runs are found in the provided venting
tables.
2. In no case should the vent or vent connector diameter be
less than the diameter specified in the provided venting
tables.
3. The minimum vent capacity determined by the sizing
tables must be less than the low fire input rating and
the maximum vent capacity must be greater than the
high fire input rating.
4 . Single appliance vents - If the vertical vent or tile lined
chimney has a larger diameter or flow area than the vent
connector, use the vertical vent diameter to determine
the minimum vent capacity and the vent connector
diameter to determine the maximum vent capacity.
The flow area of the vertical vent, however, shall not
exceed 7 times the flow area of the listed appliance
categorized vent area, drafthood outlet area or flue
collar area unless designed according to approved
engineering methods.
Issue 1624
NOTE: The chimney must be properly sized
per provided venting tables or lined with
listed metal lining system.
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