Metal Fab CG Installation Instructions

CG AL29-4C Stainless Steel - Pressure Rated Venting System
CGV 444 Stainless Steel - Pressure Rated Venting System
IMPORTANT: DO NOT INSTALL WITHOUT FIRST READING THESE
INSTRUCTIONS VERY CAREFULLY.
Corr/Guard, manufactured by Metal-Fab, Inc. is a special stainless steel
venting system for gas-fired 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), and rated for positive pressure of 15" w.c. Metal-Fab,
Inc. recommends the system be inspected once a year by a qualified service
technician.
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 severe stress of
joints upon completion of assembly. This venting system must be free
to expand and contract. 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 manufactures.
Corr/Guard Double Wall vent is designated as Model CG or CGV and may be
used to vent any appliance where AL29-4C
the appliance manufacturers installation instructions and performance criteria
is within the limitations in these instructions.
Venting system design may be limited by appliance performance. Consult
appliance installation instructions to determine proper sizing and limitations
such as maximum horizontal length, maximum height, maximum number of
elbows or offsets, connecting two or more appliances to a common venting
system, and other limitations, which may affect design and installation.
The authority having jurisdiction (such as gas inspection authority, municipal
building department, fire department, fire prevention bureau, etc.) should
be consulted before installation to determine the need to obtain a permit.
NOTE: The Corr/Guard venting system is rated for 15" w.c. based on tests
requiring an internal pressure 2-1/2 times the rated pressure.

GENERAL

Corr/Guard is to be installed in accordance with these installation instructions
and those of the appliance manufacturer.
restrictions not specifically mentioned herein, contact building or fire officials
having jurisdiction in your area.
• Planning the layout of the vent system before installation may eliminate
unforeseen problems.
• Consider horizontal runs, elbows, system height, clearances, firestopping,
and terminations.
• Corr/Guard Model CG or CGV double wall vent may be used with Model
CGSW or CGVSW single wall vent within the same vent system.
• Any portion of a horizontally installed vent shall have a slope (upwards for
Cat. II, III or IV appliances or downwards for Cat. III or IV appliances) not
less than 1/4 inch (6.4 mm) every 12 inches (305 mm) to prevent collection
of condensate at any location in the assembly.
• Means shall be provided for drainage of condensate. Due to ice build up and
blockage, it is required that the proper slope be employed when the vent is
installed in a horizontal installation.
• Consult the appliance installation instructions for further details regarding
the installation of condensate drain fittings.
• Identify the condensate discharge point and determine routing of condensate
drain piping.
• WARNING: Do not place or install insulation in any required clearance
spaces surrounding the venting system.
A venting system that exits through a side wall shall:
1. Terminate not less than 12 inches (305 mm) above the ground.
2. Be located above the snow line in geographical areas where snow
accumulates.
3. Not be located in traffic areas such as walkways unless the venting
system is at least 7 feet (2.1 m) above the ground.
When appliance incorporates a combustion air inlet system, the venting
system shall terminate:
1. 6 feet (1.8m) or more from the combustion air intake of any appliance.
2. More than 3 feet (0.9m) from any other building opening, gas utility meter,
service regulator or the like.
3. Less distance if specified in the appliance's installation instructions.
The venting system shall terminate 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, Natural Gas Installation Code, or
CAN / CGA-149.2 Propane Installation Code, as applicable.
CORR/GUARD
DOUBLE WALL
INSTALLATION INSTRUCTIONS
or 444 vent material is specified in

For conditions and applicable
Rated Operating Minimum Clearance
Temperatures
Diameter Temp. Horizontal
330°F
177°C
3" Only
400°F 6"
204°C
480°F 6"
249°C
3", 4" & 5"
550°F
288°C
4" & 5" Only 300°F 3"
149°C

VENT CLEARANCES

Framing of openings shall provide proper clearances, support, and the
installation of firestop assemblies where applicable. (See TABLE 2)
Examples of acceptable methods of installation which demonstrate minimum
clearances and supporting means are show below:
HORIZONTAL DRAIN TEE
ELBOW
APPLIANCE ADAPTER
SEAL AT APPLIANCE WITH
HIGH TEMPERATURE RTV
Side Wall
Installation
For venting systems that extend through any zone above that on which the
connected appliance is located (except for one and two family dwellings), the
vent system shall be enclosed with an enclosure having a fire resistance rating
equal to or greater than that of the floor or roof assemblies through which it
passes.
When installed on Cat. II, III or IV appliances, Corr/Guard shall not be routed
into, through or within any other vent, existing masonry or factory built vent.
Exception: An abandoned masonry vent may be used to route the venting
system if no other appliance is vented into the same masonry vent and the
venting system is terminated beyond the terminus of the masonry vent.
To limit condensation and provide additional protection, it is recommended that
vents exterior to the structure and below the roofline be enclosed.
10'
SEE NOTE 2
STORM COLLAR
SEE NOTE 1
SUPPORT CLAMP
Note 1 - Apply caulking or
Metal-Fab MST Tape where vent
passes through storm collar.
Note 2 - 2' minimum height
above any roof surface within 10'
horizontally.
FIRESTOP
HANGER STRAP
APPLIANCE ADAPTOR
SEAL AT APPLIANCE WITH
HIGH TEMPERATURE RTV
APPLIANCE

TABLE 1

Minimum Clearance
Enclosed Unenclosed
Vertical Horizontal
0" 0" 0"
0mm 0mm 0mm
0" 1"
25mm 0mm 25mm
1" 1"
25mm 25mm 25mm
N/A N/A 1"
25mm
1" 1"
76mm 25mm 25mm
TERMINATION
7' MAX.
OR DRAIN FITTING
HANGER
STRAP
WALL
THIMBLE
TO DRAIN, DISPOSE OF
CONDENSATE ACCORDING
TO LOCAL CODE
APPLIANCE
3' MIN.
FLASHING
FIRESTOP
HORIZONTAL
DRAIN TEE OR
DRAIN FITTING
WITH TEE
TO DRAIN
Vertical
DISPOSE OF
CONDENSATES
Installation
ACCORDING TO
LOCAL CODES
Vertical
0"
0mm
0"
0mm
1"
25mm
1"
25mm
1"
25mm