Lennox International Inc DAVE LENNOX SIGNATURE COLLECTION GAS FURNACE, SL280DFV

PERMANENTLY

SEALED FIREPLACE

OPENING

Venting Using a Masonry Chimney

The following additional requirements apply when a lined masonry chimney is used to vent this furnace.

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 B1 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 meth- od must be found.

Insulation for the flexible vent pipe must be an encapsu- lated fiberglass sleeve recommended by the flexible vent pipe manufacturer. See figure 16.

Common Venting Using Metal−Lined Masonry Chimney

SEALED

Common Venting Using Tile−Lined Interior Masonry Chimney and Combined Vent Connector

NOTE− Refer to provided venting

tables for installations.

MINIMUM LENGTH = AS SHORT AS PRACTICAL. FOR MAXIMUM LENGTH SEE NOTE TO LEFT

VENT

CONNECTOR

OTHER

APPLIANCE

INTERIOR TILE−LINED

MASONRY CHIMNEY

NOTE − the chimney must be properly sized per provided venting tables or lined with listed metal lining system.

PERMANENTLY

SEALED FIREPLACE

OPENING

FURNACE

FIGURE 15

DO NOT insulate the space between the liner and the chimney wall with puffed mica or any other loose gran- ular insulating material

IMPORTANT

		MAX. LENGTH
		−− SEE NOTE
		BELOW.
5 ft. (1.5 m)
		MIN. LENGTH −− AS	EXTERIOR
	minimum
		SHORT AS PRACTICAL
			CHIMNEY WITH
			METAL
			LINER

VENT CONNECTOR

4 in. (102 mm) minimum

FURNACE

OTHER

APPLIANCE

NOTE 1 − Refer to the provided venting tables for installations.

FIGURE 16

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 ac- cording 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:

SThe chimney is currently serving at least one drafthood equipped appliance

SThe vent connectors and chimney are sized according to the provided venting tables.

If type B1 double-wall vent is used inside a chimney, no oth- er 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 as- sembly 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 SL280DFV series 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.

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