Metal Fab MLK User manual

METAL-FAB INC. • P.O. BOX 1138, WICHITA, KANSAS 67201 • [phone]
MODEL MLK & MLKE
CHIMNEY LINING AND
VENT CONNECTOR SYSTEMS
Listing No. MH 17528
Tested to UL 1777 & ULC 3635
(For Chimney Liners)
Listing No. MH 25730
(For Vent Connectors)
MODEL MLK
Flex Aluminum Chimney Liner Kit
Kit Includes:
•Gas Liner
•Mortar Guard
•Rain Cap
•Factory Attached Couplings
•Flashing
•Pull Bar
•Storm Collar
MODEL MLKE
Flex Aluminum Chimney Liner Kit
Kit Includes:
•Gas Liner
•Mortar Guard
•Rain Cap
•Hardware Package (9ea. Self Tapping Screws)
•Flashing
•Coupling (5.5” Dia. Only)
CAUTION:
Metal-Fab gas vent relining systems have been designed to properly vent Category I gas-burning appliances only. Appliances
burning solid or liquid fuels or Category II, III, or IV furnaces are not to be connected to this lining system.
This Metal-Fab lining system is intended for use as a masonry chimney liner, factory-built chimney liner, or Type-B gas vent liner.
Metal-Fab liners are intended to be installed in accordance with the standard for chimneys, replaces, vents and solid fuel burning
appliances, per NFPA 211.
NOTE: When an existing gas, oil, or wood burning appliance is being replaced by a gas burning appliance, the existing
chimney can be used as a conduit for a exible aluminum liner. The inside of the existing system must be of sufcient
diameter to allow the liner to pass through and the existing system must have been properly installed (See Manufacturer’s
instructions for details).
Although this product may be installed in an unenclosed space between the appliance and the masonry chimney,
factory-built chimney, or Type-B gas vent, it must not pass through any combustible structure such as a wall, ceiling,
oor, attic space, or crawl space. Contact local building or re ofcials about restrictions and installations in your area.
Metal Fab gas vent relining systems have been designed to properly vent gas burning appliances. Substituting other
parts not identied within these instructions may pose an unsafe installation. Acceptance of the lining system is void if
the installation instructions are not followed.
Wall penetration assemblies are not to be located directly behind a heating appliance.
The chimney liner must not be sized less than that specied in the appliance manufacturers instructions. Correct sizing
of liner is critical for venting of low temperature ue products in geographical areas experiencing sustained low ambient
temperatures.
Prior to installing a liner system in a masonry chimney, the chimney is to be thoroughly cleaned and inspected. Check
for cracked, loose or missing bricks, mortar or other materials that could inhibit correct liner installation. Repair chimney
as required. Removal of all tar glazed creosote is a must prior to installation of chimney liner. Verify the air space
clearances between the masonry chimney exterior and combustible materials is in accordance with applicable building
code requirements.
Prior to installing linear system in a factory-built chimney or Type-B gas vent, the chimney is to be thoroughly cleaned
and inspected. Check for structural defects that all parts (such as support, radiation shield, restop, etc.) specied by
the chimney or vent manufacturer. Repair chimney or vent as required. Removal of all tar glazed creosote is a must
prior to installation of chimney liner. Verify that the airspace clearances between chimney or vent exterior casing and
combustible material is in accordance with the installation instructions.
Wear gloves when handling metal parts to avoid personal injury.
INSTALLATION AND MAINTENANCE
INSTRUCTIONS

2
The liner should terminate with the lowest discharge opening no closer
to the roof than the minimum height shown in the table below. These
minimum heights may be used provided the vent is not less than 8 ft.
(2.4 m) from any vertical wall.
Roof Pitch Minimum Height
Flat to 6/12 1.0 foot (305mm)
6/12 to 7/12 1.25 feet (380mm)
Over 7/12 to 8/12 1.5 feet (451mm)
Over 8/12 to 9/12 2.0 feet (610mm)
Over 9/12 to 10/12 2.5 feet (762mm)
Over 10/12 to 11/12 3.25 feet (991mm)
Over 11/12 to 12/12 4.0 feet (1218mm)
Over 12/12 to 14/12 5.0 feet (1524mm)
Over 14/12 to 16/12 6.0 feet (1829mm)
Over 16/12 to 18/12 7.0 feet (2134mm)
Over 18/12 to 20/12 7.5 feet (2286mm)
Over 20/12 to 21/12 8.0 feet (2438mm)
GENERAL:
MLK and MLKE gas vent lining systems are listed by UL & ULC for
installation at zero clearance to the inside masonry surface and with
zero clearance from the outside surface of the masonry chimney and
surrounding combustible material.
Do not place insulation or other materials in required clearance spaces
surrounding the liner unless otherwise specied.
Use only parts referenced in the these instructions when installing a MLK
or MLKE liner system. Never substitute liner material.
Rain caps and ashing must be used to prevent moisture from entering
the liner and entering the space between liner and chimney. Bird screens
on rain caps may be necessary and/or required in some areas but could
be susceptible to blockage through freezing moisture. Consult authority
having jurisdiction before using bird screen.
Metal-Fab MLK liners may be extended from the outlet (top), to the cap
using Type-B gas vent. MLK and MLKE liners may be extended from
the inlet (bottom) to the appliance using exible MLCK connectors (See
FIG. 6 & 8).
Metal-Fab MLK and MLKE liners may be connected continuously from
the appliance to the termination cap, provided that the liner is always
in an unenclosed space or is within a masonry chimney, factory built
chimney, or Type-B gas vent.
CONNECTOR
(MLK ONLY)
STORM COLLAR
(MLK ONLY)
CAP
FLASHING
FLEXIBLE LINER
NON-COMBUSTIBLE
FILLER MATERIAL
MORTAR GUARD
FLEXIBLE LINER
APPLIANCE OUTLET
(CONNECTOR
COLLAR NOT
PROVIDED)
APPLIANCE
FIG. 1
These liner systems are NOT listed as Type-B gas vent and are
not intended to pass through any wall, ceiling, attic, crawl space or
other combustible area. A liner that is used as a connector in open
and unenclosed space must be installed with minimum clearance to
combustibles, in accordance with NFPA 211. The appliance to which the
exible liner is connected shall be listed gas-red appliance equipped
with a draft hood or other appliance listed for use with Type-B Vent.
To size the liner system, follow the Category 1 venting table now
contained in the National Fuel Gas Code NFPA 54/ANSI Z223.1 in the
USA or CAN CSA-B149.1 in Canada. Be certain to follow the capacity
reduction directions for the corrugated metallic chimney liner systems.
While installing exible liner, consideration should be given to the
following: 1) make no unnecessary bends 2) make no bends greater
than 90° 3) make bends as smooth as possible, with no dips or sags and
4) install with at least a 1/4” per foot rise.
Before installing liner authorities having jurisdiction (such as Gas
Inspection Authority, Municipal Building Department, Fire Department,
Fire Prevention Bureau, etc.) should be consulted to determine the need
to obtain a permit.
The installer must post the completed date of installation notice at the
point where the connection is made to the appliance. This notice shall
include date of installation, the manufacturer’s name, the model number
and class of lining system, and a reminder to homeowners to check the
rain cap for icing during low ambient temperatures.
INSTALLATION:
1. MLK/MLKE: Determine the length of the liner needed by dropping a
pre-measured length of rope or other measuring device down the
chimney. If the liner is to mate directly to an appliance, measure all
the way to the appliance. Otherwise, measure to a point that is just
outside of the chimney that is being re-lined.
2. MLK/MLKE: If installing the liner into a masonry chimney, determine
the location of the point where the ex system will penetrate the
masonry sidewall. This opening must be located above the appliance
outlet. It is recommended that you install an inspection/cleanout
door on the opposite side of the chimney, if conditions permit.
3. MLK/MLKE: To congure the liner to it’s proper length, remove the
liner from the carton. One person (wearing gloves) is to securely
grasp one end of the liner while the second person (also wearing
gloves) pulls and stretches the liner from the other end. Both persons
should be on level ground when stretching the liner. Pull and stretch
to the required length, being careful not to over-stretch the liner.
NOTE: For shipping purposes, the exible liner has been
compressed to approximately 1/3 it’s usual length. A
25-foot (7.62 m) length will be approximately 8 feet
(2.44 m) in the carton. For taller chimneys two lengths of
liner can be joined together (See Flex Extension on
Page 4).
4. MLKE Only: While still on level ground, press a termination into the
ashing until the tapered termination collar makes contact with
ashing. Attach one end of the exible liner to the portion of the
termination protruding below the ashing (use 3 ea. screws
provided). Attach sleeve/connector to the inlet (bottom) end
of the exible liner (use 3 ea. screws provided). Temporarily
attach a bolt through the holes that are provided in the sleeve
connector to serve as a pull bar. You are now ready to lower the ex
into the chimney from the top down (See FIG. 2).
5. MLK Only: This liner has a B-Vent style connector
pre-attached to the outlet (top) end of the ex and a stainless
steel slip connector pre-attached to the inlet (bottom) end.
You are now ready to lower the ex into the chimney from
the top down.

3
6. MLK and MLKE: Secure a rope to the bolt or pull bar(s)
on the inlet (bottom) connector (NOT INCLUDED WITH KIT). Drop
the other end of the rope down the chimney for an assistant
to pull the liner down the chimney (See FIG. 3). As the liner is
being pulled through the chimney, a person is needed at the top to
guide the exible liner down the chimney.
*Contact Metal-Fab for connector availability.
7. MLK and MLKE: If the ex liner is to exit the sidewall of a
masonry chimney, it must pass through the mortar
guard (See FIG. 4). The mortar guard is positioned so that
the labeled edge of the mortar guard (and tag, if applicable)
extends approximately 2 inches (50 mm) past the exterior
surface of the chimney. NFPA211 requires that the warning
label on the mortar guard be visible after the installation is
completed. The opening in the masonry chimney can be
closed and mortared around the mortar guard. When the
liner is in position to start at the appliance (or just outside
the chimney, at the inlet end) and in position at the
termination cap, remove the rope and the connector bolts
or pull bar(s). Discard MLK pull bar(s).
8. MLKE Only: At the outlet end, attach the ashing to the
chimney, apply a bead of silicone sealant around termination and
ashing (See FIG. 5).
9. MLK only: At the outlet end, slide the ashing and storm
collar over the outlet tting. Twist the cap onto the tting.
Attach the ashing to the chimney. Push down on the cap
until it rests on the storm collar.
FIG. 3
ROPE
SUPPORT / CONNECTOR
(NOT INCLUDED WITH KIT)
FIG. 5,
MLKE Only
FLEX ATTACHES TO
TERMINATION COLLAR
USE A SILICONE
SEALANT HERE
FIG. 4
NON-COMBUSTIBLE
FILLER MATERIAL
WARNING LABEL
MUST BE VISIBLE
AFTER INSTALLATION
APPROX. 2”
(50mm) SPACING
APPLIANCE
FIG. 6
FLASHING
(MLK ONLY)
INTERIOR WALL
NON-COMBUSTIBLE
FILLER MATERIAL
MORTAR GUARD
FLEXIBLE LINER
APPLIANCE
10. MLK and MLKE Inlet Connection Options
A) Attach the inlet end of the exible liner to a single gas appliance,
using a draft hood connector or other B-Vent style appliance
adapter that may be needed for a secure connection. Be careful
not to make any abrupt or sharp bends in the ex or create any
bends greater than 90 degrees (See FIG. 6).
FIG. 2,
MLKE Only
SLEEVE / CONNECTOR
(5.5 MLKE ONLY)
ATTACH BOLT THROUGH HOLE TO
PULL THROUGH CHIMNEY
(BOLT AND CONNECTOR NOT
SUPPLIED WITH KIT*)
FLEX LINER
FLASHING
#8 X 1/2 SHEET
METAL SCREWS
(3ea.) INLET
& OUTLET
(PROVIDED)
INLET END
SLEEVE / CONNECTOR
(5.5 MLKE ONLY)

P.O. Box 1138 • WICHITA, KANSAS 67201
[phone] • FAX [phone]
[email protected] • www.metal-fabinc.com ©2013 Metal-Fab, Inc. Form No. L1215 04/13
8855
MAINTENANCE INSTRUCTIONS:
The chimney lining system should be checked by a qualied
person at least once a year following initial installation.
To inspect the liner, remove the Rain Cap via the three securing screws
for MLKE and twist lock counter clockwise for MLK. Check appliance
manufacturer’s instructions to see if any particular precautions should be
taken on initial ring of any appliance that is vented through a chimney
liner.
FIG. 7
OPTIONAL MLCK
LINER USED AS AN
EXTENSION
APPLIANCE #1
FLEXIBLE LINER
MORTAR GUARD
NON-COMBUSTIBLE
FILLER MATERIAL
B-VENT OR RIGID
SINGLE WALL
CONNECTOR
CLEARANCE TO
COMBUSTIBLES
PER LOCAL CODE
FOR TYPE OF
CONNECTOR USED
INTERIOR WALL
FIG. 8
B-VENT TEE
FLEXIBLE, RIGID, OR
TYPE-B VENT AS PER
LOCAL CODE
CLEARANCE TO
COMBUSTIBLES PER
LOCAL CODE FOR TYPE
OF CONNECTOR USED
APPLIANCE #1 APPLIANCE #2
B) Attach the inlet end of the exible liner to either single wall pipe or
B-Vent pipe that is serving as the connector between a single gas
appliance and the ex liner (See FIG. 7).
C) Attach the inlet end of the exible liner to a “Y” or “Tee” which
is, in turn, connected to single wall pipe, B-Vent pipe, or exible
MLCK connector that is serving as the connector between two
gas appliances (See FIG. 8).
11. After making all connections, check the system for soundness of
connections and compliance with clearance to combustibles.
SHEET METAL
SCREW
CONNECTOR
(NOT INCLUDED
WITH KIT)
FLEXIBLE LINER
FIG. 9
FLEX EXTENSIONS:
MLK/MLKE: For tall chimney installations where more than one length of
ex is required, two lengths may be connected together. Additional liner
FLX will be required for extending length. Extend liner by inserting ex
connector (NOT INCLUDED WITH KIT) into one end of two liners and
secure with three sheet metal screws at each end (See FIG. 9).
CAUTION: Size and overall length of extended liner must follow
the Category I Venting table in NFPA 54/ANSI Z223.1
(USA) and CAN/CSA-B149.1 (Canada).