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Special Gas Vent

Special Gas Vent

Models - CG/CGV & FCS

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.
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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
condensing 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

 

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

 

Category IV
Combustion Efficiency
Over 87%
Use only pressurizable special gas 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

 

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