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Special Gas Vent

Special Gas Vent

Models - CG/CGV, FCS, and FCG
Single and Double-Wall Positive Pressure Special Gas Vent engineered for venting today’s high efficiency natural gas-burning or propane fired appliances, categories II, III and IV as defined by the Standard for Gas-Fired Central Furnaces, ANSI Z21.47 and NFPA 54.
Special Gas Vent

Corr/Guard® & Corr/Guard® Value Series

Single Wall & Double Wall Special Gas Vent
Corr/Guard® products are tested and listed to UL 1738 for positive pressure applications up to 15" w.g.  Corr/Guard® features our exclusive Snap-Lock design in single wall and male to female slip connection in double wall, secured with self-tapping sheet metal screws.  Manufactured from superferritic AL29-4C stainless steel flue for corrosion resistance and continuous laser welded seams creates proper joint alignment, increasing product reliability and ease of installation in the field.
 

Application

For use with high efficiency category II, III and IV natural gas-burning or propane fired appliances such as gas boilers, furnaces, unit and radiant tube heaters, tankless water heaters, pool heaters and direct vent appliances.

 

Appliance Vent Categories
  Negative pressure venting Positive pressure venting
Category I
Combustion Efficiency
83% or less
Use standard venting Masonry or Type B Vent

 

Category III
Combustion Efficiency
83% or less
Use only pressurizable vent as specified by manufacturer

 

Category II
Combustion Efficiency
Over 83%
Use only special condensing service vent as specified by manufacturer

 

Category IV
Combustion Efficiency
Over 87%
Use only pressurizable special condensing service vent as specified by manufacturer

 

 
 

Listings/Standards

NFPA 54

UL 1738

ULC-S636

Construction

Flue Material Thickness:

    3" - 5"/.015, AL29-4C (Standard) or 444 stainless steel (Optional)

 

Casing Material Thickness:

    3" - 5"/.018, aluminized (Standard), 430, 304, or 316 stainless steel (Optional)

Diameters

3" - 5"

Clearances

 

FCS 6"-24"

Single Wall & Double Wall Special Gas Vent
Corr/Guard® is tested and listed to UL 1738 for positive pressures up to 15" w.g., featuring a durable AL29-4C superferritic stainless steel flue designed for extreme resistance to chloride ion pitting, crevice corrosion, stress corrosion cracking and corrosion in moderately reducing environments.  FCS Corr/Guard® incorporates an integral joint sleeve for easy joint alignment and aides to shingle condensate across the joint, preventing excessive joint corrosion and leakage.  FCS products are manufactured with continuous laser welded seams and casings, improving durability and reliability and increasing efficiency.
 
Application
For use with high efficiency category II, III and IV natural gas-burning or propane fired appliances including gas boilers, furnaces, booster heaters, pool heaters, unit and radiant tube heaters and direct vent appliances.
Listings/Standards
NFPA 54
UL 1738
ULC-S636
Construction
Flue Material Thickness:
    6" - 12"/.015, AL29-4C stainless steel
    14" - 24"/.024, AL29-4C stainless steel

Casing Material Thickness:
    6" - 12"/.018, aluminized (Standard); 6" - 12"/.024, 430, 304, or 316 stainless steel (Optional)
    14" - 24"/.024, aluminized (Standard), 430, 304, or 316 stainless steel (Optional)
Diameters
6" - 24"
Clearances
 

FCG 26"-36"

Single Wall & Double Wall Special Gas Vent
FCG products are designed for use with high efficiency natural gas burning or propane fired appliances. FCG Corr/Guard® is tested and listed to UL 1738 for positive pressures up to 15" w.g. and features a flanged joint with an interlocking band that is sealed with a high temperature silicone sealant for maximum strength and durability.  The flanged design prevents excessive joint corrosion and leakage, increasing product lifecycle, reliability and efficiency.
 
Application
For use with high efficiency category II, III and IV natural gas-burning or propane fired appliances including gas boilers, furnaces, booster heaters, pool heaters, unit and radiant tube heaters and direct vent appliances.
Listings/Standards
NFPA 54
UL 1738
ULC-S636
Construction
Flue Material Thickness:
    26" - 36"/.035, AL29-4C stainless steel

Casing Material Thickness:
    26" - 36"/.035, aluminized (Standard); 6" - 12"/.024, 430, 304, or 316 stainless steel (Optional)
Diameters
26" - 36"
Clearances
 
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