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Venting Requirements
Approved Vent Systems:
Lennox Hearth Products Co-linear Chimney Liner Kit Recommended:
• The Flex Kit, Cat. No. H0909 includes one 35 feet flex liner and four
gear clamps.
• The Termination Kit, Cat. No. TKDVI includes the termination cap with two
co-linear collars for 3 inches (76 mm) flex attachments and flashing.
• The Flex and Termination Kit, Cat. No. DV3FK35 includes two flex liners,
termination cap and four gear clamps.
Secure Vent™ Co-Linear Chimney Liner Kit Recommended:
• Direct-Vent Vertical Termination Kit (includes Vertical Termination
Cap gas/Connector, Flashing, Qty 2 of 25 feet (7.6 M) length of 3 inches
(76 mm) Aluminum Flex, Clamps and Sealant) #DV3FK25
• Direct-Vent Vertical Termination Kit (includes Vertical Termination Cap/
Connector, Flashing, Qty 2 of 35 feet length of 3 inches Aluminum
Flex, Clamps and Sealant) #DV3FK35
Standard Simpson Dura-vent Co-linear Chimney Liner Kit recom-
mended:
• Direct-Vent Vertical Termination Cap #991
• Liner Termination Kit
(includes termination connector and flashing) #923GK
• 3" x 35 feet (76 mm x .91 M) Alum Flex #2280
Selkirk/Metalbestos Direct-Temp Co-Linear Chimney Liner Kit recom-
mended
• Direct-Vent Vertical Termination Cap #4DT-VC
• Liner Termination Kit
(includes termination connector and flashing) #4DT-CTB
• 3" x 35' (76 mm x .91 M) Aluminum Flex #AF3-35L
Amerivent Direct Co-Linear Chimney Liner Kit recommended
• Direct-Vent Vertical Termination Cap #4DVC
• Co-Linear Adaptor #4DCAT33
• Flashing #4DF or #5DF
• 3" x 35' Aluminum Flex #3AFL-35
NOTE: Terminating the air intake liner as shown here may not be
allowed by some local codes. Check with the authority having jurisdic-
tion for your area.
Exhaust 3" (75mm) UL
1777. A full length liner
is required from the
exhaust outlet on appli-
ance to center collar of
termination cap.
Air Inlet Liner (for combustion air) When
terminating the air inlet liner at this point, a
positive flue connection is required (to ensure
combustion air is drawn down the chimney
only).
Masonry and Factory Built Fireplaces
Figure 6a - Terminating Air Inlet in Chimney
The outside air inlet does not
require a full reline (if intake
liner is terminated in chimney
and a positive flue connection
is achieved as specified).
Existing Fireplace Flue
(chimney)
Positive Flue Con-
nection (sealing
fireplace throat
using a noncombus-
tible seal-off plate
or insulation).
NOTE: DIAGRAMS AND ILLUSTRATIONS ARE NOT TO SCALE
Positive Flue Connection
Masonry and Factory Built Fireplaces
A qualified installer should evaluate the existing fireplace to determine
the best method for achieving a positive flue connection between the vent
and intake liners and the chimney.
The existing fireplace chimneys may take
various contours which the flexible liners will
accommodate. However, keep the flexible liner
as STRAIGHT as possible, avoid unnecessary
bending.
Vertical Cap
Liner Requirements:
Use 3" (76 mm) diameter listed gas
vent liner (UL1777 ONLY) for the
EXHAUST
Use 3" (76 mm) diameter listed
liner (UL 181 or UL1777) for the
AIR INTAKE.
Vertical Height Min. = 10 ft. (3.05 M)
Vertical height Max. = 35 ft. (10.67 M)
The flexible vent pipe
must NOT be allowed to
sag behind insert or in
fireplace flue.
Make sure that both liners will pass through existing damper area. Remove
or lock damper to allow the passage of the flexible liners. If the damper
will not allow the passage of both liners, DO NOT PROCEED FURTHER.
(If fireplace is masonry) Consult a local mason for removal of the damper
without risk of structural damage or leakage (if the fireplace is factory
built) The appliance may NOT be installed into the fireplace.
Figure 6b
WARNING
Do not substitute the heat-rated flex liner (UL1777) for the
exhaust with any other type liner or a fire may result caus-
ing property damage, personal injury or loss of life.
The standard cap
in Termination Kit,
TKDVI, is a high
wind cap
Termination
Connector
Exhaust
Intake
Combustion Air Intake
11
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