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FACTORY-BUILT CHIMNEYS FOR RESIDENTIAL TYPE AND BUILDING HEATING APPLIANCES

Test Standard:  UL 103

Scope:  These requirements cover factory-built chimneys intended for venting gas, liquid, and solid-fuel fired residential-type appliances and building heating appliances in which the maximum continuous flue-gas outlet temperatures do not exceed 1000°F (538°C). Factory-built chimneys are intended for installation in accordance with the Standard for Chimneys, Fireplaces, Vents, and Solid-Fuel Burning Appliances, NFPA 211, and in accordance with codes such as the International Mechanical Code, the International Residential Code, and the Uniform Mechanical Code. They are intended for installation inside or outside of buildings in a manner that provides a vertical conduit or passageway to transport flue gases to the outside.

Application:  UL 795 Commercial-Industrial Gas Heating Equipment, NON-CONDENSING APPLIANCE (84% or less efficiency).  Examples: steam boilers, scotch marine boilers, vertical tubeless boilers, cast iron sectional boilers, etc.

Maximum Gross Stack/Vent temperature:  1000°F

Stack/Vent system pressure:  Positive (up to 60” W.C.), Neutral, and Negative

General Constructions:  Inner (304/316 stainless steel), Insulation (air or 1/2/4” fiber insulation), Jacket (aluminized, Galvalume, or 304/316 stainless steel jacket)

Sizing:  NFPA 211

 

 

1400 DEGREE FAHRENHEIT FACTORY-BUILT CHIMNEY

Test Standard:  UL 103

Scope:  These requirements cover factory-built 1400 degree Fahrenheit chimneys intended for venting gas, liquid, and solid-fuel-fired appliances in which the maximum continuous flue-gas temperatures do not exceed 1400°F (760°C).

Application:  UL 795 Commercial-Industrial Gas Heating Equipment, NON-CONDENSING APPLIANCE (84% or less efficiency).  Examples: turbine/Gen exhaust, bread/pizza ovens, fumes, coffee roasters, etc.

Maximum Gross Stack/Vent temperature:  1800°F

Stack/Vent system pressure:  Positive (up to 60” W.C.), Neutral, and Negative

General Constructions:  Inner (304/316 stainless steel), Insulation (air or 1/2/4” fiber insulation), Jacket (aluminized, Galvalume, or 304/316 stainless steel jacket)

Sizing:  NFPA 211(Chimneys), NFPA 37 (Stationary Combustion Engines and Gas Turbines)

 

 

MEDIUM HEAT APPLIANCE FACTORY-BUILT CHIMNEYS

Test Standard:  UL 959

Scope:  These requirements cover factory-built chimneys intended for venting gas, liquid, and solid-fuel-fired medium-heat type appliances in which the maximum continuous flue-gas temperatures do not exceed 1800°F (980°C).

Factory-built chimneys are intended for installation in accordance with the Standard for Chimneys, Fireplaces, Vents, and Solid-Fuel Burning Appliances, NFPA 211, and in accordance with codes such as the International Mechanical Code, and the Uniform Mechanical Code.

 

TYPE B GAS VENT

Test Standard:  UL441

Scope:  These requirements cover Types B and BW gas vents and Types B and BW gas vent roof jacks intended for venting gas appliances equipped with draft hoods.  Type B vents are also intended for use with other Category I appliances that specify they are for use with Type B gas vents.  Gas vents are intended for installation in accordance with the Standards of the National Fire Protection Association for Chimneys, Fireplaces, Vents, and Solid-Fuel Burning Appliances, NFPA 211 and the National Fuel Gas Code, NFPA 54. Gas vents are also intended for installation in accordance with the Department of Housing and Urban Development Mobile Home Construction and Safety Standards, Chapter II of 24 CFR, Part 280, and codes such as the BOCA Basic/National Mechanical Code, the Standard Mechanical Code, and the Uniform Mechanical Code.

Application:  NON-CONDENSING APPLIANCE (84% or less efficiency), Listed gas appliances with draft hoods and other Listed gas appliances specified for use with Type B Gas Vent or ANSI Z21 Category I appliances

Maximum Gross Stack/Vent temperature:  470° F

Stack/Vent system pressure:  Negative, (Less than -0.02” W.C.)

General Constructions:  Inner (Aluminum), Insulation (1/4 to 1” air), Jacket (aluminized/Galvalume steel jacket)

Sizing:  NFPA-54, ICC, IFGC, UMC Gas Vent Tables

 

 

SPECIAL GAS VENT

Test Standard:  UL1738

Scope:  These requirements cover venting systems intended for venting Category II, III, or IV gas-burning appliances as defined by the Standard for Gas-Fired Central Furnaces (except Direct-Vent Central Furnaces), ANSI Z21.47 and the National Fuel Gas Code, NFPA 54. Venting systems covered by these requirements are intended to be used with Category II, III, and IV appliances that have been installed in accordance with NFPA 54, and with codes such as the BOCA National Mechanical Code, the Standard Mechanical Code, the Uniform Mechanical Code, and local codes.

Application: ANSI Z21.13/Z21.10 appliances, CONDENSING (85% or more efficiency), OR NON-CONDENSING (84% or less efficiency) appliances, and Listed gas appliances specified for use with Categories II, III, and IV or per appliances installation instructions.

Maximum Gross Stack/Vent temperature:  Steel 550° F (boilers or water heater), Polypropylene 230° F (water heater only)

Stack/Vent system pressure:  Positive (3” W.C. and Up), Neutral, and Negative

General Constructions:  Steel – Inner (AL294C/Duplex stainless), Insulation (1” air), Jacket (stainless steel outer), note some come with aluminized or galvanized jackets, not a good idea.   Polypropylene – Polypropylene, single wall only

Sizing:  Per appliance’s installation instructions (equivalent feet or NFPA 211 or NFPA 54)

 

 

CHIMNEY LINERS

Test Standard: UL 1777

Scope:  These requirements cover metallic and nonmetallic chimney liners intended for field-installation into new or existing masonry chimneys that are used for the natural draft venting of Category I gas-fired, Type L vented oil-fired, and solid-fuel-fired residential-type appliances in which the maximum continuous flue-gas outlet temperatures do not exceed 1000°F (538°C).

Chimney liners are intended to be installed in existing masonry chimneys with or without a liner of fire-clay tile, or to be used as a substitute for masonry fire-clay tile flue liners in new chimneys

Chimney liners are intended to be installed in accordance with the Standard for Chimneys, Fireplaces, Vents, and Solid Fuel Burning Appliances, NFPA 211; National Fuel Gas Code, NFPA 54, and codes such as the International Building Code, International Gas Code, International Mechanical Code, International Residential Code, and the Uniform Mechanical Code.

Chimney liners as covered by these requirements are not intended for use with Category II, III, or IV gas burning appliances as defined by the National Fuel Gas Code, NFPA 54, or other appliances that result in condensation of corrosive acids on the liner or the chimney, or that create positive pressures in the chimney system.

Application:  NON-CONDENSING APPLIANCE (84% or less efficiency), liner for older or new chimneys

NOTE: If the appliance is condensing (85% or more efficiency), use single wall UL 1738 (SPECIAL GAS VENT)

Maximum Gross Stack/Vent temperature: 1000°F

Stack/Vent system pressure: Negative

General Constructions:  Single wall 316 stainless steel

Sizing:  NFPA 54 and NFPA 211 (when out of range on NFPA 54)

 

 

FACTORY BUILT UL LISTED GREASE DUCTS FOR COMMERCIAL COOKING APPLIANCES AND 2 HOUR FIRE RESISTIVE SHAFT ENCLOSURE

Test Standard: UL 1978 (Grease Duct), UL2221 (2 HR Shaft)

Scope:  These requirements cover factory-built grease ducts and grease duct assemblies that are intended to be installed at reduced clearances, where 18 inch (457 mm) clearance is specified in the Standard for Ventilation Control and Fire Protection of Commercial Cooking Operations, NFPA 96, and the International Mechanical Code.

These requirements also cover modular grease duct assemblies, un-welded connections between adjoining duct parts, fittings, access doors, which are intended for use with grease ducts installed in accordance with NFPA 96 and the International Mechanical Code.

These requirements do not address NFPA 96 and the International Mechanical Code requirements for grease duct enclosures. Grease ducts covered only by these requirements are intended to be installed in a fire resistive enclosure when required by NFPA 96 or the IMC. Requirements used to evaluate the effectiveness of the combination of a grease duct and an enclosure as a fire-rated enclosure system and through penetration fire-stop system, as well as the enclosure’s effect on the grease duct are contained in Standard for Tests of Fire Resistive Grease Duct Enclosure Assemblies, UL 2221, and ASTM E 2336, Standard Test Methods for Fire Resistive Grease Duct Enclosure Systems.

Application:  Type I Hoods servicing Commercial Cooking Appliances

Maximum Gross Stack/Vent temperature: 550°F Continuous, 2000°F Intermittent

Stack/Vent system pressure: Positive (up to 60” W.C.), 500 FPM and up

General Constructions: Inner (304/316 stainless steel), Insulation (3” or 4” Fiber), Jacket (aluminized, Galvalume or stainless steel)

Sizing: NFPA 96

 

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