Venting Using Flexible Vent Pipe - Lennox MPD Series Installation Instructions Manual

LENNOX HEARTH PRODUCTS • MERIT PLUS
VERTICAL OR HORIZONTAL VENTING USING
SECURE FLEX ®
KITS AND COMPONENTS
®
Secure Flex venting kits and components
may be used in any venting application
where rigid Secure Vent
components can be used. All restrictions,
clearances and allowances that pertain to
the rigid piping apply to the fl exible venting.
Secure Flex kits may not be modifi ed; also,
under no circumstances may separate
sections of fl ex pipe be joined together.
Secure Flex kits may be added to the end
of a vent run made up of rigid Secure Vent
(SV4.5) vent sections provided that doing so
does not violate any of the venting length,
height, routing, horizontal to vertical ratio
requirements or clearance considerations
detailed in this manual.
Secure Flex kits come with an included
adaptor that can be fi tted to the appliance
collar or the inclined channel end of the last
Secure Vent (SV4.5) vent section in a rigid
system in the exact same fashion as any
other Secure Vent section. Align the dimpled
end of the adaptor over the previously
installed section or appliance collar, adjusting
the radial alignment until the four locking
dimples of the adaptor are aligned with the
inlets of the four incline channels of the last
vent section or collar. Push on the adaptor
until it fully engages, then twist the adaptor
clockwise running the dimples down and
along the incline channels until they seat at
the end of the channels.
Attach the fl exible vent to the adaptor as
follows (see Figure 42):
A. Install the Inner Flex Pipe
1. Install the small gear clamp loosely around
the inner fl exible vent pipe, push it back out
of the way.
2. Apply a bead of Mill-Pac Black (700°F)
high temperature sealant—Catalog
No. 10K81) to the inner adaptor collar,
approximately 1/2 inch from the end.
3. Pull and extend the inner fl exible vent pipe.
4. Slide the inner fl ex pipe over the
adaptor collar. Ensure the fl exible vent pipe
completely engages the adaptor collar to a
distance of 1 3/4 inches from the end, and
that it is free from damage or tears.
5. Slide the gear clamp down and tighten it
fully to secure the fl exible vent to the adaptor
inner collar approximately 3/4 inch from the
end of the fl ex.
6. Install three screws 120 degrees apart
through the fl exible vent pipe and into the
adaptor collar just below the gear clamp to
provide additional security to the connection.
B. Install the Outer Flex Pipe
1. Install the large gear clamp loosely around
the outer fl exible vent pipe, push it back out
of the way.
24
®
NOTE: OUTER PIPE IS PULLED AWAY TO
SHOW THE DETAIL OF THE INNER PIPE
Apply ONLY MIL-PAC BLACK HIGH
®
(SV4.5) direct vent
TEMPERATURE SEALANT (Catalog No.
10K81) to the outside surface of both
collars of the adaptor (be especially
careful to fill the grooves of the outer
collar to be covered by the flexible
pipe) and slide flexible pipe over
inner and outer adaptor collars.
Figure 42
2. Apply a bead of Mill-Pac Black (700°F)
high temperature sealant—Catalog No.
10K81) to the outer adaptor collar; to
the grooves of the collar which extend
approximately 1 inch from the end and to the
fl at surface, approximately 1 3/8 inches from
the end.
3. Pull and extend the outer fl exible vent pipe.
4. Slide the outer fl ex pipe over the
adaptor collar. Ensure the fl exible vent pipe
completely engages the adaptor collar to a
distance of 1 3/4 in. from the end, and that it
is free from damage or tears.
5. Slide the gear clamp down and tighten it
fully to secure the fl exible vent to the adaptor
outer collar approximately 3/4 inch from the
end of the fl ex.
6. Install three screws 120 degrees apart
through the fl exible vent pipe and into the
adaptor collar just below the gear clamp to
provide additional security to the connection.
C. Route Flex Vent
Ensure that the fl ex vent is properly routed to
provide the required clearance. Do Not allow
the fl exible vent to bend in a radius tighter
than 5 in. (127 mm). Refer to Figure 43.
Place the internal fl ex vent spacers evenly
and avoid kinking the inner pipe. Support
horizontal sections of fl ex vent with metal
straps at 2 ft (0.61 m) intervals.
D. Install Firestop/Spacers at ceilings and walls
When Secure Flex penetrates a wall or
ceiling, a fi restop/spacer is required: use the
SF4.5 VF fi restop/spacer for ceilings and the
SF4.5 HF fi restop/spacer for walls.
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS
1-3/4 in. (44 mm)
Flexible Pipe and
Adaptor Outer
Collar Overlap
Adaptor
(SV4.5RF)
(3 PLACES EQUALLY SPACED
(3 PLACES EQUALLY SPACED
Attach Adaptor to Appliance
Collar, or Secure Vent Sections
See the appropriate sections and fi gures
shown throughout the venting section for
their installation requirments.
Flexible Vent Section
Figure 43
E. Attach Flex Vent to Termination
Secure Flex components can be purchased
separately and attached to bulk lengths
of Secure Flex fl exible tubing cut to size
at the job site. Secure the fl exible vent to
the Secure Flex terminations in the same
manner (see Figure 42) as it was attached
to the adaptor.
Note: Secure Flex vent must be attached
to Secure Flex terminations only. DO NOT
substitute Secure Vent terminations
or the Secure Vent adaptor for Secure
Flex components. The collars of Secure
Flex terminations and adaptors have a
different circumference than that used
with the Secure Vent pipe. Additionally,
Secure Flex components have an extended
length center tube for use in attaching the
fl exible vent.
FLEX VENT
SECURING SCREW
JUST BELOW GEAR CLAMP)
GEAR
CLAMPS
1-3/4 in. (44 mm)
Flexible Pipe and
Adaptor Inner
Collar Overlap
SECURING SCREW
JUST BELOW GEAR CLAMP)
5 in. (127 mm)
Radius Minimum