Metal Fab AL29-4C User manual

CORR/GUARD
INSTALLATION INSTRUCTIONS
This symbol on the nameplate
means this product is listed by
Underwriters Laboratories Inc.
Tested to UL1738 / CAN / ULCS636-08
Listing No. MH26687
Testing No. 11EN
SMALL DIAMETER CORR/GUARD
& SLEEVED CORR/GUARD
PRESSURE RATED VENTING SYSTEM
AL29-4C®STAINLESS STEEL
CONDENSING APPLIANCES
CAT. II, III, IV APPLIANCES
FUME EXHAUST
3”(76mm) - 36”(914mm) DIAMETERS
C US
IMPORTANT: DO NOT INSTALL WITHOUT FIRST READING THESE INSTRUCTIONS
VERY CAREFULLY.
•EXAMINE ALL COMPONENTS FOR POSSIBLE SHIPPING DAMAGE
BEFORE INSTALLATION.
•PROPER JOINT ASSEMBLY IS ESSENTIAL FOR A SAFE INSTALLATION.
FOLLOW THESE INSTRUCTIONS EXACTLY AS WRITTEN. CHECK
SEVERENESS OF JOINTS UPON COMPLETION OF ASSEMBLY.
•THIS VENTING SYSTEM MUST BE FREE TO EXPAND AND CONTRACT.
SUPPORT SYSTEM IN ACCORDANCE WITH THESE INSTRUCTIONS.
CHECK FOR UNRESTRICTED MOVEMENT THROUGH WALLS, CEILINGS,
AND ROOF PENETRATIONS. DIFFERENT MANUFACTURERS HAVE
DIFFERENT JOINT SYSTEMS AND ADHESIVES. DO NOT MIX PIPE,
FITTINGS, OR JOINING METHODS FROM DIFFERENT MANUFACTURERS.
METAL-FAB, INC. P.O. BOX 1138, WICHITA, KS 67201-1138

2
GENERAL
CORR/GUARD VENTING SYSTEM INSTALLATION
INSTRUCTIONS
Corr/Guard is a special stainless steel venting system for gas-red
appliances listed as Cat. II, III & IV or in Canada, Type BH Gas Venting
Systems per ULC-636, with rated operating temperature of 550°F (287°
C). Corr/Guard is rated for positive pressure of 15” (381mm) w.c. for
3” (76mm) diameter through 36” (914mm) diameter. Metal-Fab, Inc.
recommends the system be inspected once a year by a qualied service
technician.
Venting system design may be limited by appliance performance.
Consult appliance installation instructions to determine proper sizing
and limitations such as maximum horizontal length and height,
maximum number of elbows or offsets, connecting two or more
appliances to a common venting system, and other limitations that
may affect design and installation. Permits may be required before
starting an installation. Installation is to be in accordance with local
building code requirements and National Codes: USA – NFPA 54
ANSI-Z223.1 or NFPA 211. In Canada – CAN/CGA-B149.1 or
CAN/CGA-B149.2 Propane Installation Code as applicable. It is
the responsibility of the installer to contact local building and re
ofcials concerning any installation restrictions and/or inspection
requirements that may apply.
Corr/Guard is to be installed in accordance with these installation
instructions and those of the appliance manufacturer. For conditions
and applicable restrictions not specically mentioned herein, contact
building or re ofcials having jurisdiction in your area. The following is a
guide to assist a professional installer:
•  Proper operation of the venting system and appliance is dependant
on the use of all parts specied by Metal-Fab for use in the particular
installation. System performance may be affected if the proper
assembly of all required parts is not accomplished.
•  Refer to appliance’s instructions to determine proper sizing and
connection of the venting system to the appliance.
•  Corr/Guard Model CG, FCS, FCS-1 & FCS-2 double wall vent may
be used with Model CGSW & FCSSW single wall vent within the
same vent system.
•  Tee sections should only be used in conjunction with a drain on
appliances tested for use with a drain, or if allowed by the appliance
manufacturer for multiple appliance connections.
•  If required by the appliance manufacturer, a drain tting must be
located as close as possible to the appliance ue outlet. Unless a
drain tting is supplied with the appliance, install only a Corr/Guard
Drain Fitting.
•  More than one Category II, III or IV appliance may not be connected
into the same vent system, unless the appliance manufacturer
specically approved such a system and the appliances are
designed for multiple venting. Cat. II, III or IV appliances MAY NOT
share any part of their vent system with a natural draft appliance.
•  Check the joints and seams for gas tightness when using the
venting system with a Cat. III or Cat. IV appliance.
•  Except for installation in one and two family dwellings, a venting
system that extends through any zone above that on which the
connected appliance is located shall be provided with an enclosure
having a re resistance rating equal to or greater than that of the
oor or roof assemblies through which it passes.
•  Corr/Guard shall not be routed into, through, or within any other
vent, such as an existing masonry or factory-built chimney ue that
is connected to another appliance.
•  WARNING! Do not place or install insulation in any required
clearance spaces surrounding the venting system.
•  Enclosure of exterior mounted venting systems below the roof line
is recommended to limit condensation and protect from mechanical
damage.
When the Corr/Guard vent system is installed, check joints for tightness.
Repair any joint leaks by disassembling and resealing following the
guidelines in the Joint Assembly section of these instructions. Replace
any defective component.
(TABLE 1) CLEARANCE TO COMBUSTIBLES
Corr/Guard SINGLE WALL (CGSW & FCSSW)
Rated Operating Minimum Clearance Minimum Clearance
Temperatures Enclosed Unenclosed
Pipe Dia. Temp. Horiz. Vert. Horiz. Vert.
Single Wall
3”&4”
(76mm - 102mm)
(CGSW)
400°F
(204°C)
480°F
(249°C)
550°F
(288°C)
8”
(203mm)
8”
(203mm)
N/A
4”
(102mm)
4”
(102mm)
N/A
1”
(25mm)
2”
(51mm)
2”
(51mm)
1”
(25mm)
2”
(51mm)
2”
(51mm)
Single Wall
5”
(127mm)
(CGSW)
400°F
(204°C)
480°F
(249°C)
550°F
(288°C)
N/A
N/A
N/A
6”
(152mm)
6”
(152mm)
N/A
1”
(25mm)
2”
(51mm)
2”
(51mm)
1”
(25mm)
2”
(51mm)
2”
(51mm)
Single Wall
6”-12”
(152mm - 305mm)
(FCSSW)
480°F
(249°C)
550°F
(288°C)
N/A
N/A
N/A
N/A
2”
(51mm)
2”
(51mm)
2”
(51mm)
2”
(51mm)
Single Wall
14”-18”
(356mm - 457mm)
(FCSSW)
480°F
(249°C)
550°F
(288°C)
N/A
N/A
N/A
N/A
3”
(76mm)
3”
(76mm)
3”
(76mm)
3”
(76mm)
Single Wall
20”-24”
(508mm - 610mm)
(FCSSW)
480°F
(249°C)
550°F
(288°C)
N/A
N/A
N/A
N/A
4”
(102mm)
4”
(102mm)
4”
(102mm)
4”
(102mm)
Single Wall
26”-30”
(660mm - 762mm)
(FCSSW)
480°F
(249°C)
550°F
(288°C)
N/A
N/A
N/A
N/A
5”
(127mm)
5”
(127mm)
5”
(127mm)
5”
(127mm)
Single Wall
32”-36”
(813mm - 914mm)
(FCSSW)
480°F
(249°C)
550°F
(288°C)
N/A
N/A
N/A
N/A
6”
(152mm)
6”
(152mm)
6”
(152mm)
6”
(152mm)
(TABLE1) CLEARANCE TO COMBUSTIBLES
Corr/Guard DOUBLE WALL (CG, FCS, FCS-1 & FCS-2)
Rated Operating Minimum Clearance Minimum Clearance
Temperatures Enclosed Unenclosed
Pipe Dia. Temp. Horiz. Vert. Horiz. Vert.
Double Wall
3”-5”
(76mm - 127mm)
(CG)
300°F
(149°C)
480°F
(249°C)
550°F
(288°C)
3”
(76mm)
6”
(152mm)
N/A
1”
(25mm)
1”
(25mm)
N/A
1”
(25mm)
1”
(25mm)
1”
(25mm)
1”
(25mm)
1”
(25mm)
1”
(25mm)
Double Wall 6”-12”
(152mm - 305mm)
(FCS/FCS-1/FCS-2)
480°F
(249°C)
550°F
(288°C)
N/A
N/A
1”
(25mm)
1”
(25mm)
1”
(25mm)
1”
(25mm)
1”
(25mm)
1”
(25mm)
Double Wall 14”-18”
(356mm - 457mm)
(FCS/FCS-1/FCS-2)
480°F
(249°C)
550°F
(288°C)
N/A
N/A
1”
(25mm)
1”
(25mm)
2”
(51mm)
2”
(51mm)
1”
(25mm)
1”
(51mm)
Double Wall 20”-24”
(508mm - 610mm)
(FCS/FCS-1/FCS-2)
480°F
(249°C)
550°F
(288°C)
N/A
N/A
1”
(25mm)
1”
(25mm)
3”
(76mm)
3”
(76mm)
1”
(25mm)
1”
(76mm)
Double Wall 26”-30”
(660mm - 762mm)
(FCS/FCS-1/FCS-2)
480°F
(249°C)
550°F
(288°C)
N/A
N/A
2”
(51mm)
2”
(51mm)
4”
(102mm)
4”
(102mm)
2”
(51mm)
2”
(51mm)
Double Wall 32”-36”
(813mm - 914mm)
(FCS/FCS-1/FCS-2)
480°F
(249°C)
550°F
(288°C)
N/A
N/A
2”
(51mm)
2”
(51mm)
5”
(127mm)
5”
(127mm)
2”
(51mm)
2”
(51mm)
The Corr/Guard ventilation system, manufactured by Metal-Fab, Inc.
is constructed to exacting standards. The proper operation of this vent
system is dependant on the use of correct components, proper sizing,
quality of installation, and guidelines and limitations expressed by the
appliance manufacturer.

3
USE AND INSTALLATION OF INDIVIDUAL PARTS:
These instructions comprise both general and specific requirements for
all parts in the product line. Before specifying a design or beginning an
installation, these instructions should be carefully reviewed.
PIPE WEIGHT
The average weight of the chimney, per foot of length, can be calculated
using the following formula.
FCSSW (6”-24”): 0.30 x diameter = lbs per foot
FCS (6”-24”): 0.70 x diameter = lbs per foot
FCS-1 (6”-24”): 0.85 x diameter = lbs per foot
FCS-2 (6”-24”): 0.95 x diameter = lbs per foot
FCSSW (26”-36”): 0.40 x diameter = lbs per foot
FCS (26”-36”): 0.80 x diameter = lbs per foot
FCS-1 (26”-36”): 0.95 x diameter = lbs per foot
FCS-2 (26”-36”): 1.05 x diameter = lbs per foot
Example: 8FCS-1: 0.85 x 8 = 6.80 lbs per foot
Vent design should make provisions for support adequate to ensure that
vent components are not overloaded.
PART NUMBERS
These instructions identify Model FCS, FCS-1 & FCS-2 parts by name
of part number in the text and illustrations. Actual parts also carry a flue
diameter prefix and a three digit “CTO” suffix which defines the materials
of construction, such as 8FCS24-CA1 for an 8-inch diameter double wall
pipe section 24 inches long with AL29-4C stainless steel inner flue wall,
aluminized steel outer casing wall and 1” insulation. (See TABLE 2 for
further explanations of CTO codes).
TABLE 2
1ST DIGIT 2ND DIGIT 3RD DIGIT
(INNER WALL) (OUTER WALL) (INSULATION)
C = AL29-4C A = ALUMINIZED STEEL 0 = AIR SPACE
4 = 304 S/S 1 = 1” INSULATION
6 = 316 S/S 2 = 2” INSULATION
JOINT ASSEMBLY-SINGLE WALL
3”- 5” (76mm - 127mm) DIAMETER CGSW
Each Corr/Guard vent component contains a seal gasket on the
female end of the vent joint and locking tabs. Mechanical fastening
of the joint is automatic and requires no tools. Visually check the
gasket for proper location within the pipe bead during assembly or ue
gases could leak, resulting in carbon monoxide poisoning. Assembly
of joints is shown below:
NOTE: When assembling 3”-5” Diameter Corr/Guard vent, always install
the the female ue end elevated above the male ue end.The “UP” arrow
will point to the elevated female ue end. Change of directions are made
by using a male to male or female to female adapter depending on the
ow of the condensate.
1. Insert the male end of the vent pipe into the adjoining
female vent section until the bead of the male joint stops
at the edge of the female joint.
NOTE: If the seal gasket pushes out of the groove during the
assembly process, apply a light lm of synthetic based lubricant to
the top surface of the gasket or spray a light lm of soapy water on
the top surface of the gasket. Visually check that the gasket has not
pushed out of the ue bead.
2. When properly inserted to the fullest extent, the integral locking tabs
will snap into place, securing the joint Before proceeding, verify
that all locking tabs are engaged for each joint assembly.
JOINT ASSEMBLY-DOUBLE WALL
3”- 5” (76mm - 127mm) DIAMETER CG
Connections between vent and ttings are male/female type. The inner
duct is sealed with an integral seal gasket and the joint is mechanically
secured via the overlapping outer wall of the double wall pipe.
NOTE: When assembling 3”-5” Diameter Corr/Guard vent, always install
the the female ue end elevated above the male ue end. The “UP”
arrow will point to the elevated female ue end. Change of directions are
made by using a male to male or female to female adapter depending on
the ow of the condensate.
Joints are assembled per the following steps:
1. Before assembly, observe that the seal gasket is located within the
female inner pipe joint. Locate next pipe or tting with male inner
pipe joint and insert to begin engagement of inner pipe joint.
NOTE: If the seal gasket pushes out of the groove during the
assembly process, apply a light lm of synthetic based lubricant to
the top surface of the gasket or spray a light lm of soapy water on
the top surface of the gasket. Visually check that the gasket has not
pushed out of the ue bead.
2. As the joint further engages, align the male and female ends of the
outer wall of each pipe so that they begin to engage as the pipes are
further pushed together.
3. Pipe joint is fully engaged when the female end of the outer pipe
comes in contact (or is at least within 3/16” 5mm) to the base of the
bead on the male end of the adjoining vent pipe.
4. When possible look within the pipe assembly to verify that no sign
of seal gasket is showing. Complete the joint assembly by
securing the joint using #8 x 1/2” sheet metal screws (3 per joint)
at each pre-punched hole on the female end of each joint.
WARNING: SHEET METAL SCREWS ARE FOR DOUBLE WALL
OUTER CASING ONLY. NEVER USE SCREWS, RIVETS OR OTHER
FASTENERS TO PENETRATE THE INNER FLUE WALL.
1
4
2
3
FIG. 2
SEAL
GASKET
3/16” GAP (MAX.)
INSERT MALE END UNTIL THE END OF THE
FEMALE PROFILE MAKES CONTACT WITH
THE MALE PROFILE BEAD.
FIG. 1 VERIFY THAT TABS “SNAP”
INTO LOCKING POSITION.

4
JOINT ASSEMBLY-LARGE DIAMETER
6”- 36” (152mm - 914mm) DIAMETER FCSSW, FCS, FCS-1 & FCS-2
Connection Tips For Sealant Applications (See FIG. 3):
The Corr/Guard (Model FCS and FCSSW) joint sealing system is
designed for quick and easy installation:
NOTE: When assembling 6”-36” diameter Corr/Guard vent, always
install the female ue end elevated above the male ue end. Change of
directions are made by using a male to male or female to female adapter
depending on the ow of the condensate.
1. Inspect anged surfaces just prior to installation, and if contaminated
with oil or dirt, clean with rubbing alcohol. Apply a continuous bead
of P070 or P077 sealant in the corner of the sleeve and ange.
2. Join the two anged ends of the pipe sections. compressing the
P070 or P077 sealant just applied.
3. Fill the channel of Flange Band with P070 or P077 Sealant.
4. Install the ange band around the anges and rmly tighten (Torque:
2 ft-lbs to 5 ft-lbs.). DO NOT over tighten for risk of damage
to joint. DO NOT locate the fasteners of the ange
band on the bottom side of vent for horizontal
installations.
IMPORTANT: Allow P070 or P077 Sealant to cure 24 hours
before operating appliances.
5. (FCS-1 & FCS-2 INSTALLATIONS ONLY) Pack the void between
inner and outer walls with insulation strips.
6. Secure the outer casing with the casing closure band. Apply clear
silicone sealant to closure band for exterior applications only.
TABLE 3
SUPPORT PIPE DIA./MODEL DIST. BETWEEN
SUPPORTS
HORIZONTAL
RUNS
(INCLUDING
BETWEEN
ELBOWS)
3”-5” (76mm-125mm) CG & CGSW 7’ (2.13m)
6”-24” (152mm-610mm) FCS & FCSSW 7’ (2.13m)
6”-24” (152mm-610mm) FCS-1 6’ (1.83m)
6”-24” (152mm-610mm) FCS-2 5’ (1.52m)
26”-36” (660mm-914mm) FCS & FCSSW 10’-6” (3.20m)
26”-36” (660mm-914mm) FCS-1 10’ (3.05m)
26”-36” (660mm-914mm) FCS-2 9’ (2.70m)
VERTICAL SUPPORTS
• Unless installed in a re rated shaft, a re stop / vertical support is
required when penetrating oors and ceilings.
• Vertical supports are to be used after each transition to vertical. Refer
to TABLE 4 for support methods and heights.
TABLE 4
SUPPORT METHODS PIPE DIAMETER / MODEL MAXIMUM HEIGHT
PLATE SUPPORTS
3”-5” (76mm-125mm) CG/CGSW 30’ ( 9.1m)
6”-12” (152mm-305mm) FCS 50’ (15.2m)
6”-12” (152mm-305mm) FCS-1 41’ (12.5m)
6”-12” (152mm-305mm) FCS-2 37’ (11.3m)
6”-12” (152mm-305mm) FCSSW 100’ (30.5m)
14”-24” (356mm-610mm) FCS 30’ ( 9.1m)
14”-24” (356mm-610mm) FCS-1 25’ ( 7.6m)
14”-24” (356mm-610mm) FCSSW 75’ (22.9m)
26”-36” (660mm-914mm) FCS/FCSSW 100’ (30.5m)
26”-36” (660mm-914mm) FCS-1 85’ (25.9m)
26”-36” (660mm-914mm) FCS-2 75’ (22.9m)
WALL BAND
6”-16” (152mm-406mm) FCS 8’ (15.2m) INTERIOR
6”-16” (152mm-406mm) FCS-1 7’ ( 2.1m) INTERIOR
6”-14” (152mm-406mm) FCS-2 6’ ( 1.8m) INTERIOR
6”-12” (152mm-305mm) FCSSW 8’ (15.2m) INTERIOR
ROOF SUPPORTS
(PLATE SUPPORT
AT ROOF FOR
FREE STANDING)
3” - 5” (76mm-125mm) CG/CGSW 5’ ( 1.5m)
6”-24” (152mm-610mm) FCS/FCSSW 5’ ( 1.5m)
6”-24” (152mm-610mm) FCS-1/FCS-2 5’ ( 1.5m)
26”-36” (660mm-914mm) FCS/FCSSW 10’ ( 3.0m)
26”-36” (660mm-914mm) FCS-1/FCS-2 10’ ( 3.0m)
WALL SUPPORTS
(GUIDE EVERY
10’ (3.0M)
FOR EXTERIOR)
3” - 5” (76mm-125mm) CG/CGSW 6’ ( 1.8m) EXTERIOR
3” - 5” (76mm-125mm) CG/CGSW 30’ ( 9.1m) INTERIOR
6”-24” (152mm-610mm) FCS/FCSSW 8’ ( 2.4m) EXTERIOR
6”-24” (152mm-610mm) FCS-1 8’ ( 2.4m) EXTERIOR
6”-22” (152mm-610mm) FCS-2 8’ ( 2.4m) EXTERIOR
6”-24” (152mm-610mm) FCS/FCSSW 30’ ( 9.1m) INTERIOR
6”-24” (152mm-610mm) FCS-1 25’ ( 7.6m) INTERIOR
6”-22” (152mm-610mm) FCS-2 22’ ( 6.7m) INTERIOR
26”-36” (660mm-914mm) FCS/FCSSW 40’ (12.2m) INTERIOR
26”-36” (660mm-914mm) FCS-1 34’ (10.4m) INTERIOR
26”-36” (660mm-914mm) FCS-2 30’ ( 9.1m) INTERIOR
STACK SUPPORTS
6”-24” (152mm-610mm) FCS 30’ ( 9.1m)
6”-24” (152mm-610mm) FCS-1 25’ ( 7.6m)
6”-24” (152mm-610mm) FCS-2 22’ ( 6.7m)
6”-12” (152mm-305mm) FCSSW 30’ ( 9.1m)
14”-24” (356mm-610mm) FCSSW 20’ ( 6.1m)
26”-36” (660mm-914mm) FCS/FCSSW 100’ (30.5m)
26”-36” (660mm-914mm) FCS-1/FCS-2 100’ (30.5m)
NOTE: Wall Hanger 3”-5” CG/CGSW alignment only, not a vertical support.
INSTALLATION
HORIZONTAL SUPPORTS
Use non-combustible hanger straps of Half Angle Rings (HAR). See
TABLE 3 to support the vent system from ceiling joints or other solid
structures (see FIG. 4)
WARNING: DO NOT PUNCTURE VENT SYSTEM.
• Vent must not sag or dip, providing areas for condensate to collect.
FIG. 3
1 2 3
4 5 6
SEE TABLE 3 TERMINATION
HANGER
STRAP OR H.A.R.
WALL
PENETRATION
ROUTE TO DRAIN.
DISPOSE OF CONDENSATE
ACCORDING TO LOCAL CODE.
ELBOW
APPLIANCE ADAPTER
H.A.R = HALF
ANGLE
RING
APPLIANCE
FIG. 4
SIDE WALL TERMINATION
INSTALLATION
HORIZONTAL DRAIN TEE
OR DRAIN FITTING

5
PLATE SUPPORT ASSEMBLY
The Plate Support Assembly is designed to provide support to vertical and
horizontal sections. The Plate Support must be attached to the building structure
or support with rigid structural members. Proper clearance to combustible
construction must be maintained.
For maximum support, attach the entire perimeter of the Plate Support Assembly
to the structural framing. (See FIG. 5). Structural members are supplied by the
installer. The Flange Band is placed between the Support Plate and the Clamp
Rings and aligned with notches for the Flange Band Clamps. Align holes of
the support plate and Clamp Rings and assemble together using the hardware
provided.
Vertical vent systems can be suspended pre-assembled and lowered into
a shaft. Refer to TABLE 5 for maximum height that can be suspended from
overhead. Do not pre-assemble in the horizontal position and raise to the
vertical position for installation.
WARNING: ALL JOINTS MUST BE PROPERLY ASSEMBLED
AND ALLOWED TO CURE BEFORE LIFTING FOR
INSTALLATION.
WALL PENETRATION
1. Prior to installation, determine proper location of wall thimble so that
a minimum slope of 1/4” (6mm) per foot is maintained in the
horizontal section of vent to ensure proper ow of condensation.
2. Prepare the wall by cutting a square opening per TABLE 6. (Opening
size adequate to insert Wall Thimble components)
3. Install the Wall Thimble by inserting the larger of the two parts
on the appliance (interior) side.
4. Next, apply a bead of sealant around the edges of the
exterior (smaller of the two parts) Wall Thimble component. Then
install this part of the Wall Thimble by inserting the smaller collar into
the other component from the previous step.
NOTE: The two horizontal cylinders of the Thimble must engage a
minimum of two inches.
5. Fasten both sides of the Wall Thimble using screws or nails.
6. Once the Thimble is installed, Corr/Guard vent pipe can be inserted
into the Thimble. For 3” - 5” diameter Corr/Guard insert the male
end rst. (See FIG. 6, 7 & 8).
7. Assemble Corr/Guard vent from the Wall Thimble section back to the
appliance.
8. Install a horizontal termination to complete the assembly.
9. Once assembly is completed, apply a bead of high-temp sealant
around the pipe and the exterior plate of the Thimble to protect
against weather.
TABLE 5
Height
Diameter FCSSW FCS FCS-1 FCS-2
6”(152mm) 229’(70m) 75’(23m) 62’(19m) 55’(17m)
7”(178mm) 215’(66m) 70’(21m) 58’(18m) 52’(16m)
8”(203mm) 200’(61m) 70’(21m) 58’(18m) 52’(16m)
9”(229mm) 190’(58m) 60’(18m) 49’(15m) 44’(13m)
10”(254mm) 175’(53m) 60’(18m) 49’(15m) 44’(13m)
12”(305mm) 145’(44m) 50’(15m) 41’(15m) 37’(11m)
14”(356mm) 120’(37m) 50’(15m) 41’(15m) 37’(11m)
16”(406mm) 120’(37m) 50’(15m) 41’(15m) 37’(11m)
18”(105mm) 105’(32m) 45’(14m) 37’(11m) 33’(10m)
20”(508mm) 105’(32m) 45’(14m) 37’(11m) 33’(10m)
22”(559mm) 95’(29m) 40’(12m) 33’(10m) 30’( 9m)
24”(610mm) 90’(27m) 40’(12m) 33’(10m) 30’( 9m)
26”(660mm) 90’(27m) 50’(15m) 40’(12m) 40’(12m)
28”(711mm) 90’(27m) 40’(12m) 40’(12m) 30’( 9m)
30”(762mm) 80’(24m) 40’(12m) 40’(12m) 30’( 9m)
32”(813mm) 80’(24m) 40’(12m) 30’( 9m) 30’( 9m)
34”(864mm) 70’(21m) 40’(12m) 30’( 9m) 30’( 9m)
36”(914mm) 70’(21m) 30’( 9m) 30’( 9m) 30’( 9m)
FIG. 5
FLUE
CASING
FLANGE BAND
CLAMP RING
PLATE
STRUCTURAL BRACING
(BY OTHERS)
FIG. 6
2” MIN.
OVERLAP
OUTSIDE BUILDING
SURFACE
SEALANT
INSIDE BUILDING
SURFACE
WOOD STUD
TO TERMINATION TO APPLIANCE
WALL THIMBLE INSTALLATION
3”- 5” (76mm-127mm) CGSW
FIG. 7
WALL THIMBLE INSTALLATION
3”- 5” (76mm-127mm) CG
SEALANT
CASING END CLOSURE
TERMINATION
TO APPLIANCE
FIG. 8
WALL THIMBLE INSTALLATION
6”- 36” (152mm-914mm) FCSSW, FCS, FCS-1 & FCS-2
CASING END
CLOSURE
TERMINATION
SEALANT
RADIATION
SHIELD
(SINGLE WALL)

6
HORIZONTAL TERMINATIONS
A venting system that exits through a side wall shall:
• Terminate not less than 12 inches (305 mm) above the ground.
• Be located above the snow line in geographical areas where snow
accumulates.
• Not be located in trafc areas such as walkways unless the venting
system is at least 7 feet (2.1 m) above the ground (See FIG. 9).
When an appliance incorporates a combustion air inlet system, the
venting system shall terminate:
• 6 feet (1.8m) or more from the combustion air intake of any
appliance.
• More than 3 feet (0.9m) from any other building opening, gas utility
meter, service regulator or the like.
• Less distance is permitted if specied in the appliance’s installation
instructions.
TABLE 6
PIPE DIAMETER FRAMING DIMENSIONS (MINIMUM)
3”-5” (76mm-127mm)
CGSW (SINGLE WALL)
(PIPE DIA.+5”) x (PIPE DIA.+5”)
(PIPE DIA.+127mm) x (PIPE DIA.+127mm)
3”-5” (76mm-127mm)
CG (DOUBLE WALL)
(PIPE DIA. + 5”) X (PIPE DIA. + 5”)
(PIPE DIA.+127mm) x (PIPE DIA.+127mm)
6”-24” (152mm-610mm)
FCSSW (SINGLE WALL)
(PIPE DIA. + 6”) X (PIPE DIA. + 6”)
(PIPE DIA.+152mm) x (PIPE DIA.+152mm)
6”-24” (152mm-610mm)
FCS & FCS-1 (DOUBLE WALL)
(PIPE DIA. + 6”) X (PIPE DIA. + 6”)
(PIPE DIA.+152mm) x (PIPE DIA.+152mm)
6”-24” (152mm-610mm)
FCS-2 (DOUBLE WALL)
(PIPE DIA. + 8”) X (PIPE DIA. + 8”)
(PIPE DIA.+203mm) x (PIPE DIA.+203mm)
26”-36” (660mm-914mm)
FCSSW (SINGLE WALL)
(PIPE DIA. + 8”) X (PIPE DIA. + 8”)
(PIPE DIA.+203mm) x (PIPE DIA.+203mm)
26”-36” (660mm-914mm)
FCS & FCS-1 (DOUBLE WALL)
(PIPE DIA. + 8”) X (PIPE DIA. + 8”)
(PIPE DIA.+203mm) x (PIPE DIA.+203mm)
26”-36” (660mm-914mm)
FCS-2 (DOUBLE WALL)
(PIPE DIA. + 10”) X (PIPE DIA. + 10”)
(PIPE DIA.+254mm) x (PIPE DIA.+254mm)
VERTICAL TERMINATIONS
• Enclose residential exterior vent systems below the roof line or use
double wall Corr/Guard (CG/FCS/FCS-1/FCS-2) to limit condensation
due to cool down of ue gases.
• The total equivalent length from the appliance outlet to the termination
shall not exceed maximum length specied by the appliance
manufacturer’s installation instructions.
• Vertical terminations must terminate no less than 2’ (0.61m) above the roof
or any wall or vertical structure closer than 8’ (2.4m). A vent cap or other
equivalent termination is required to keep rain or debris out of the vent.
AC
D
AE
B
CA = 12 IN. MIN.
B = 3 FT. MIN.
C = 4 FT. MIN.
D = 7 FT. MIN.
E = LESS THAN 10 FT.
FIG. 9
1. Starting at the appliance outlet, attach the rst section or appliance
adaptor. (See FIG. 10 & 11 for typical installation.)
2. Continue assembly of pipe until nearing a ceiling
penetration. Locate and cut hole in oor and ceilings
that will be penetrated. Hole size must maintain minimum listed clearances
per TABLE 1.
3. Install a restop
support when
penetrating the
ceiling to support the
vertical run of the
vent system.
4. When installing
a restop in the
attic, the restop
or support plate is
located on top of
the joist to prevent
insulation from
falling into the joist.
5. Continue with the
vent penetrating
the roof. At the roof,
the opening must
maintain a minimum
of clearance to
combustibles as
specied in these
instructions and on
the labeled vent
product.
6. Above the roof, a
ashing and storm
collar are required.
Use high temperature
sealant to seal the
storm collar to the
vent so that rain will
not penetrate the roof
opening (See FIG.
12, 13 & 14).
FIG. 10
RAINCAP
STORM COLLAR FLASHING
SUPPORT CLAMP
FIRESTOP
SEE TABLE 3
FIRESTOP
HANGER
STRAP
APPLIANCE
ADAPTER
APPLIANCE
HORIZONTAL
DRAIN TEE OR
DRAIN FITTING
WITH TEE.
TO DRAIN
DISPOSE OF
CONDENSATE
ACCORDING TO
LOCAL CODES.
FIG. 11
MORE THAN 10’ (3m)
10’ (3m)
2’ MIN. HEIGHT
ABOVE ANY
ROOF SURFACE
WITHIN 10 FT. (3m)
HORIZONTAL
CHIMNEY
3’ (.9m) MIN. FLASHING
MAINTAIN CLEARANCE TO
COMBUTIBLE THROUGH
JOIST AREA SEE TABLE 1
PLATE SUPPORT-
SEE TABLE 3 FOR
MAXIMUM DISTANCE
BETWEEN SUPPORTS
FIRESTOP - LOCATE OVER
JOIST TO MAINTAIN CORRECT
CLEARANCE FROM VENT
CASING TO COMBUSTIBLE
MATERIAL.
DRAFT HOOD CONNECTOR
(IF REQUIRED) SEE
APPLIANCE INSTRUCTIONS
APPLIANCE

7
EXTERIOR INSTALLATION
Enclose exterior vent systems below the roof line or use
double wall Corr/Guard (CG/FCS/FCS-1/FCS-2) to limit condensation due
to cool down of ue gases.
1. There may be installations where Corr/Guard vent shall run vertically
- exterior to the building and a wall band support is needed. A wall
support (WS) is used to secure the vent system to a wall while
maintaining the minimum clearance to combustible construction
(See FIG. 15).
2. Wall supports must be securely fastened to a solid member of the
building using appropriate fasteners for various building materials
such as wood, steel siding or masonry.
3. Exterior mounted wall supports are to be vertically spaced per
TABLE 4 on PAGE 4.
4. Wall supports are designed to be fastened to the vent by means of
clamping externally to the vent for 3”-24” diameters. No screws are
to puncture the vent wall.
5. When system is installed outdoors, the upper side (upper half of
horizontal position) of the closure band bead should be sealed with
clear silicone sealant to make the casing water tight.
WARNING: DO NOT RIVET OR SCREW SUPPORTS TO THE VENT
OR OTHERWISE PUNCTURE THE VENT WALL.
WARNING: DO NOT PLACE ANY TYPE OF INSULATION IN ANY
REQUIRED CLEARANCE SPACES SURROUNDING THE
VENT SYSTEM.
GUY RING (FCSGR)
Chimneys that exceed 5’ above the roof, or are installed in severe
weather regions, may require a guy ring (FCSGR) to enable the chimney
to resist wind loads. The guy ring is connected to the building or other
structure by means of cables or braces.
RAINCAP
LOCKING TAB
STORM COLLAR PITCHED
FLASHING
SEE TABLE 4 FOR
MAX. HEIGHT
UNLESS SUPPORTED
BY GUY WIRES
PLATE SUPPORT
USED ABOVE OR
BELOW ROOF JOIST
SEE TABLE 1
FOR CLEARANCES
FIG. 12
ROOF INSTALLATION
3”- 5” CGSW
ROOF INSTALLATION
3”- 5” CG
RAINCAP
STORM COLLAR
PITCHED
FLASHING
ATTACHED BY USING
#8 X 1/2” SCREWS
SEE TABLE 1
FOR CLEARANCES PLATE SUPPORT
USED ABOVE OR
BELOW ROOF JOIST
FIG. 13
FIG. 14
ROOF INSTALLATION
6”- 36” FCSSW, FCS, FCS-1 & FCS-2
SEE CAP DETAIL
CAP
CLOSURE RING
STORM COLLAR
FLASHING
PLATE SUPPORT USED ABOVE
OR BELOW ROOF JOIST
FOR CLEARANCE TO
COMBUSTIBLES
SEE TABLE 1
CLOSURE
RING
JOINT
CLAMP
ALLOW AIR SPACE
BETWEEN END
OF CASING AND
CLOSURE RING
AS SHOWN
CAP DETAIL
FIG. 15
BOILER 1 BOILER 2
SEE TABLE 3
FOR DISTANCE
BETWEEN SUPPORTS
TO TERMINATION
WALL
SUPPORT
SEE TABLE 4
FOR DISTANCE
BETWEEN
SUPPORTS
SEE TABLE 1 FOR
CLEARANCES
TO DRAIN
TO DRAIN
SEE TABLE 4 FOR
MAX. HEIGHT
UNLESS SUPPORTED
BY GUY WIRES
SEE TABLE 4 FOR
MAX. HEIGHT
UNLESS SUPPORTED
BY GUY WIRES

8
MAINTENANCE INSTRUCTIONS
As with all vents, the Corr/Guard vent system should be inspected at
least annually for the presence of deposits or debris and any
accumulation should be removed. The vent system should
also be inspected at regular periods for signs of leakage of
condensate or combustion products at any joints.
If the vent system incorporates a drain hose from either an inline fitting
or from a drain tee, the hose must be inspected periodically to ensure
that water is in the trap loop. If a proper trap loop is not
maintained, exhaust from the connected appliances may accumulate
in the building area.
Where the duct is installed outside the building, the aluminized
steel outer casing must be primed and painted. The painted
surface should be maintained regularly to prevent possible
deterioration of the casing surface. The use of stainless steel outer
casing negates the need for painting.
IMPORTANT: The listing for this product is void if components
other than those supplied as Listed Components by Metal-Fab,
Inc. are used. All warranties, stated or implied, are void if this
product and the appliances to which it is connected are not
installed in accordance with their respective instructions and
local code requirements.
VARIABLE LENGTH
For installations that require non-standard vent lengths, Corr/Guard
Variable Length vent sections may be used. The vent section consists of
an inner conduit that slip fits into the outer conduit, a compression band,
or integral clamp and an outer casing (for double wall only).
3”- 5” (76mm-127mm) CG & CGSW
To install the VL vent section, first install the inner pipe section by
connecting the male section to the adjoining double or single wall
vent pipe. Insert male section until the bead of the joint stops at the
edge of the female end of the vent section.
Next, expand the length of the inner pipe to the necessary length and
tighten the integral clamping band using a hex drive or screw driver.
The VL’s are adjustable from 7 1/2” to 22” (191mm to 559mm).
Continue with the next section of vent, making sure to fully join the
inner pipe of the vent from the female end of the VL vent.
When installing double wall, finish the VL vent assembly by installing
the outer casing wall around the VL inner pipe section. Secure
the casing by installing #8x1/2” sheet metal screws at prepunched
holes (See FIG. 17).
P.O. Box 1138 • WICHITA, KANSAS 67201
[phone] • Fax [phone]
©2018 Metal-Fab, Inc. Form No. L2591 02/18
9753
6”- 36” (152mm-914mm) FCSSW, FCS, FCS-1 & FCS-2
To install the Variable Length, first apply a heavy bead of P070 or
P077 sealant into the outer vent bead. Slide the inner vent into the
outer vent. Locate the Variable Length into position and adjust to the
proper length. Follow joint assembly details on PAGE 4. Apply a bead
of P070 or P077 sealant at the joint of inner and outer vent and attach
the compression band. The VL-22 is available for diameters 6”-36”
(152mm-914mm). The VL-22 is adjustable from 9”-22” (228mm-559mm)
for 6”-24” (152mm-610mm) diameters and 7”-22” (178mm-559mm)
for 26”-36” (660mm-914mm) diameters. The VL-10 is available for
diameters 26”-36” (660mm-914mm). The VL-10 is adjustable from
7”-10” (178mm-254mm). If the inner vent sleeve is too long to fit into
adjacent vent component, trim back to fit. When installing double wall
vent system, cut the outer jacket to fit between the mating vent and install
using sheet metal screws (provided). (See FIG 18).
CONDENSATE REMOVAL
All sections of a ventilation system shall have a minimum upward slope
of 1/4”:12” for CAT II, CAT III and CAT IV appliances or downward slope
for CAT III & CAT IV appliances. Condensate Drains must be provided at
any low point within the venting system.
If an appliance does not supply a condensate drain and one is required
per the appliance manufacturer’s instructions or local codes, install a drain
fitting in the horizontal conduit, as close as possible to the appliance vent
collar.
WARNING: NEVER INSTALL A DRAIN IN A SYSTEM WITH AN
APPLIANCE NOT INVESTIGATED FOR USE WITH A
CONDENSATE DRAIN.
Sleeved Corr/Guard drain fittings contain a drain tube that should be
located at the bottom of the vent or fitting when installed properly.
A drain hose must be attached to the tube and a trap loop must be
formed into the drain hose. The trap loop should be at least four times
the appliance’s rated stack pressure in inches of water column or
sized for 15” (381mm) w.c. max. vent pressure, which ever is less
(See FIG. 16).
FIG. 16
TUBING
TRAP LOOP
(4X STACK PRESSURE)
FIG. 17
INTEGRAL
CLAMP
INNER VENT
CASING JACKET
OUTER VENT
FIG. 18
INNER VENT
OUTER VENT
BEAD
OUTER JACKET
FOR CG ONLY
SLEEVE (EXTEND
INTO ADJACENT
COMPONENT)
AIRFLOW