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Specifications for:
Multi Purpose Venting Systems & Grease Duct

  1. VSI Boiler Flue
  2. IVSI Boiler Flue
  3. Model N Singlewall
  4. IVSI Generator Exhaust
  5. Grease Duct IVSI Z3
  6. Grease Duct N, VSI, IVSI

Provide factory-built modular connector, manifold and stack system that is tested and listed by the Underwriters' Laboratories, Inc. to the UL 103 test standard

PART-1:BREECHING, CHIMNEY & STACKS

 1:1  Positive Pressure Flue

A. Provide factory-built modular connector, manifold and stack system that is tested and listed by the Underwriters’ Laboratories, Inc. for use with building heating equipment and appliances which produce exhausted flue gases at a temperature not exceeding 1000oF (Fahrenheit) under continuous operating conditions, and not exceeding 1400 oF (Fahrenheit) under intermittent operating conditions (see UL103) when burning gaseous, solid or liquid fuels as described in NFPA-211.  Additionally, the vent system shall be U.L. 103 positive pressure tested and listed.

B. The U.L. listed air insulated flue gas vent system shall have skin temperatures that have been obtained by Underwriters Laboratories (UL) test procedures. The published surface temperatures shall be the result of the UL-103 1000o Fahrenheit chimney test.

1:2 CONSTRUCTION

A. The double wall flue system shall have a 304 stainless steel inner liner and a 304 stainless steel outer jacket. The materials and construction of the modular sections and accessories shall be as specified by the terms of the product’s U.L. listing.

1. Air insulation between the inner liner and outer jacket shall be a nominal one-inch thick.

B. Aluminized steel surfaces exposed to the elements shall be protected by a minimum of one base coat of primer and one finish coat of corrosion resistant paint suitable for outer jacket skin temperatures of the given application. All primer and paint to be supplied by the installing contractor and shall be equivalent to series V2100 as manufactured by Rust-Oleum. Alternatively, an outer jacket constructed of 304 or 316 stainless steel may also be considered in lieu of painting.

C. This stack system shall be designed and installed to be gas tight and thus prevent leakage of combustion products into a building.

D. Inner pipe joints shall be securely connected and sealed with factory supplied overlapping V-bands and appropriate sealant as specified in the manufacturer’s installation instructions.

E.The vent system shall be designed to compensate for all flue gas induced thermal expansion.

PART-2: EXECUTION

2:1 INSTALLATION

A. When installed according to the manufacturer’s installation instructions, the flue system and its supporting system shall resist side loads at least 1.5 times greater than the weight per foot of the piping for both horizontal and vertical portions of the system.

B. The prefabricated flue system shall be installed according to the manufacturer’s installation instructions and shall conform to all applicable state and local codes.

C. Provide all modular straight sections, fittings, supports, guides, expansion joints, guy sections, guy tensioners, roof thimbles, roof flashings, storm collars and stack cap terminations as required to provide a complete system per the manufacturer’s installation instructions.

D. The entire flue system from the appliance outlet to the termination point, including all accessories, except as noted, shall be from one manufacturer.

E. The vertical stack termination shall be no less than two feet above any portion of the building within ten feet of the stack penetration (see NFPA-211).

F. Roof penetrations shall be suitable for the specified roof construction and shall comply with the manufacturer’s installation instructions.

PART-3: WARRANTY

3:1 WARRANTY

A. The prefabricated flue system shall be warranted against functional failure due to defects in material and manufacturer’s workmanship for a period of 15 years from date of installation

B. The inner diameter of the flue system shall be verified by the manufacturer’s venting computations. The computations used shall be technically sound, follow ASHRAE calculation methods and shall incorporate the specific flow characteristics of the inner pipe. The contractor shall furnish the exact operating characteristics of all equipment to the factory representative.

C. The manufacturer shall provide “to scale” drawings depicting the actual layout. The prefabricated flue system shall be installed as designed by the manufacturer and in accordance with the terms of the manufacturer’s warranty and in conjunction with sound engineering practices.

D. The factory built modular flue system shall be furnished by a vendor organization that assures design, installation and services coordination. As well as, providing “in-warranty” and “post-warranty” unified responsibility for owner, architect, consulting engineer and contractor.

PART-4:PRODUCTS

4.1  MANUFACTURERS

A. Product specification requirements shall be met by using Ampco Model VSI exhaust flue or equivalent as approved by the engineer. Equivalent submittals shall specify manufacturer’s model number, and other pertinent identification, and attest that the alternate material is in compliance with all specification requirements

Provide factory-built modular connector, manifold and stack system that is tested and listed by the Underwriters' Laboratories, Inc. to the UL 103 test standard

PART-1:BREECHING, CHIMNEY & STACKS

 1:1  Positive Pressure Flue

A. Provide factory-built modular connector, manifold and stack system that is tested and listed by the Underwriters’ Laboratories, Inc. for use with building heating equipment and appliances which produce exhausted flue gases at a temperature not exceeding 1000oF (Fahrenheit) under continuous operating conditions, and not exceeding 1400 oF (Fahrenheit) under intermittent operating conditions (see UL103) when burning gaseous, solid or liquid fuels as described in NFPA-211.  Additionally, the vent system shall be U.L. 103 positive pressure tested and listed.

B. The U.L. listed fiber insulated flue gas vent system shall have skin temperatures that have been obtained by Underwriters Laboratories (UL) test procedures. The published surface temperatures shall be the result of the UL-103 1000o Fahrenheit chimney test.

1:2 CONSTRUCTION

A. The double wall flue system shall have a 304 stainless steel inner liner and a 304 stainless steel outer jacket. The materials and construction of the modular sections and accessories shall be as specified by the terms of the product’s U.L. listing.

1. Ceramic fiber insulation between the inner liner and outer jacket shall be a nominal one-inch thick

B. Aluminized steel surfaces exposed to the elements shall be protected by a minimum of one base coat of primer and one finish coat of corrosion resistant paint suitable for outer jacket skin temperatures of the given application. All primer and paint to be supplied by the installing contractor and shall be equivalent to series V2100 as manufactured by Rust-Oleum. Alternatively, an outer jacket constructed of 304 or 316 stainless steel may also be considered in lieu of painting.

C. This stack system shall be designed and installed to be gas tight and thus prevent leakage of combustion products into a building.

D. Inner pipe joints shall be securely connected and sealed with factory supplied overlapping V-bands and appropriate sealant as specified in the manufacturer’s installation instructions.

E. The vent system shall be designed to compensate for all flue gas induced thermal expansion.

PART-2: EXECUTION

2:1 INSTALLATION

A. When installed according to the manufacturer’s installation instructions, the flue system and its supporting system shall resist side loads at least 1.5 times greater than the weight per foot of the piping for both horizontal and vertical portions of the system.

B. The prefabricated flue system shall be installed according to the manufacturer’s installation instructions and shall conform to all applicable state and local codes.

C. Provide all modular straight sections, fittings, supports, guides, expansion joints, guy sections, guy tensioners, roof thimbles, roof flashings, storm collars and stack cap terminations as required to provide a complete system per the manufacturer’s installation instructions.

D. The entire flue system from the appliance outlet to the termination point, including all accessories, except as noted, shall be from one manufacturer.

E. The vertical stack termination shall be no less than two feet above any portion of the building within ten feet of the stack penetration (see NFPA-211).

F. Roof penetrations shall be suitable for the specified roof construction and shall comply with the manufacturer’s installation instructions.

PART-3: WARRANTY

3:1 WARRANTY

A. The prefabricated flue system shall be warranted against functional failure due to defects in material and manufacturer’s workmanship for a period of 15 years from date of installation

B. The inner diameter of the flue system shall be verified by the manufacturer’s venting computations. The computations used shall be technically sound, follow ASHRAE calculation methods and shall incorporate the specific flow characteristics of the inner pipe. The contractor shall furnish the exact operating characteristics of all equipment to the factory representative.

C. The manufacturer shall provide “to scale” drawings depicting the actual layout. The prefabricated flue system shall be installed as designed by the manufacturer and in accordance with the terms of the manufacturer’s warranty and in conjunction with sound engineering practices.

D. The factory built modular flue system shall be furnished by a vendor organization that assures design, installation and services coordination. As well as, providing “in-warranty” and “post-warranty” unified responsibility for owner, architect, consulting engineer and contractor.

PART-4:PRODUCTS

4.1  MANUFACTURERS

A. Product specification requirements shall be met by using Ampco Model IVSI exhaust flue or equivalent as approved by the engineer. Equivalent submittals shall specify manufacturer’s model number, and other pertinent identification, and attest that the alternate material is in compliance with all specification requirements.

Provide factory-built modular connector, manifold and stack system that is tested and listed by the Underwriters' Laboratories, Inc. to the UL 103 test standard

PART-1:BREECHING, CHIMNEY & STACKS

 1:1  Positive Pressure Flue

A. Provide factory-built modular connector, manifold and stack system that is tested and listed by the Underwriters’ Laboratories, Inc. for use with building heating equipment and appliances which produce exhausted flue gases at a temperature not exceeding 1000oF (Fahrenheit) under continuous operating conditions, and not exceeding 1400 oF (Fahrenheit) under intermittent operating conditions (see UL103) when burning gaseous, solid or liquid fuels as described in NFPA-211.  Additionally, the vent system shall be U.L. 103 positive pressure tested and listed.

B. The U.L. listed fiber insulated flue gas vent system shall have skin temperatures that have been obtained by Underwriters Laboratories (UL) test procedures. The published surface temperatures shall be the result of the UL-103 1000o Fahrenheit chimney test.

1:2 CONSTRUCTION

A. The double wall flue system shall have a 304 stainless steel inner liner and a 304 stainless steel outer jacket. The materials and construction of the modular sections and accessories shall be as specified by the terms of the product’s U.L. listing.

1. Ceramic fiber insulation between the inner liner and outer jacket shall be a nominal one-inch thick

B. Aluminized steel surfaces exposed to the elements shall be protected by a minimum of one base coat of primer and one finish coat of corrosion resistant paint suitable for outer jacket skin temperatures of the given application. All primer and paint to be supplied by the installing contractor and shall be equivalent to series V2100 as manufactured by Rust-Oleum. Alternatively, an outer jacket constructed of 304 or 316 stainless steel may also be considered in lieu of painting.

C. This stack system shall be designed and installed to be gas tight and thus prevent leakage of combustion products into a building.

D. Inner pipe joints shall be securely connected and sealed with factory supplied overlapping V-bands and appropriate sealant as specified in the manufacturer’s installation instructions.

E. The vent system shall be designed to compensate for all flue gas induced thermal expansion.

PART-2: EXECUTION

2:1 INSTALLATION

A. When installed according to the manufacturer’s installation instructions, the flue system and its supporting system shall resist side loads at least 1.5 times greater than the weight per foot of the piping for both horizontal and vertical portions of the system.

B. The prefabricated flue system shall be installed according to the manufacturer’s installation instructions and shall conform to all applicable state and local codes.

C. Provide all modular straight sections, fittings, supports, guides, expansion joints, guy sections, guy tensioners, roof thimbles, roof flashings, storm collars and stack cap terminations as required to provide a complete system per the manufacturer’s installation instructions.

D. The entire flue system from the appliance outlet to the termination point, including all accessories, except as noted, shall be from one manufacturer.

E. The vertical stack termination shall be no less than two feet above any portion of the building within ten feet of the stack penetration (see NFPA-211).

F. Roof penetrations shall be suitable for the specified roof construction and shall comply with the manufacturer’s installation instructions.

PART-3: WARRANTY

3:1 WARRANTY

A. The prefabricated flue system shall be warranted against functional failure due to defects in material and manufacturer’s workmanship for a period of 15 years from date of installation

B. The inner diameter of the flue system shall be verified by the manufacturer’s venting computations. The computations used shall be technically sound, follow ASHRAE calculation methods and shall incorporate the specific flow characteristics of the inner pipe. The contractor shall furnish the exact operating characteristics of all equipment to the factory representative.

C. The manufacturer shall provide “to scale” drawings depicting the actual layout. The prefabricated flue system shall be installed as designed by the manufacturer and in accordance with the terms of the manufacturer’s warranty and in conjunction with sound engineering practices.

D. The factory built modular flue system shall be furnished by a vendor organization that assures design, installation and services coordination. As well as, providing “in-warranty” and “post-warranty” unified responsibility for owner, architect, consulting engineer and contractor.

PART-4:PRODUCTS

4.1  MANUFACTURERS

A. Product specification requirements shall be met by using Ampco Model VSI exhaust flue or equivalent as approved by the engineer. Equivalent submittals shall specify manufacturer’s model number, and other pertinent identification, and attest that the alternate material is in compliance with all specification requirements

Provide factory-built modular chimney liner & general use vent

The factory-built (chimney liner / general use vent) system shall be designed and installed to be liquid tight and thus prevent leakage of the exhaust into the building.

The system shall be designed to compensate for all thermal expansion.

The single wall exhaust shall be of type 304 (or 316) stainless steel. Minimum steel thickness shall be 0.035" (or 0.048").

Pipe joints shall be sealed by use of factory supplied overlapping V-Bands and sealant.

The entire system from outlet to the termination; including accessories, except as noted; shall be from the manufacturer.

The diameter for the exhaust shall be verified by the manufacturers’ computations. The computation shall be technically sound, shall follow ASHRAE calculation methods, and incorporate the specific flow characteristics of the pipe.

The system shall be listed as a chimney liner per ULC-S635 (Standard for Chimney Liners for Existing Chimneys),

Specification requirements shall be met by using Ampco Model N or equivalent as approved by the responsible engineer. Equivalent bids shall specify manufacturer, model number, and other pertinent identification; and attest that the alternate is in compliance with all specification requirements.

Provides factory built generator/engine exhaust system that is tested and listed by the Underwriters' Laboratories, Inc. to the UL 103 test standard.

PART-1:DIESEL ENGINE/GENERATOR EXHAUST

 1:1  SCOPE

A. Provide factory built exhaust system that is tested and listed by the Underwriters’ Laboratories, Inc. for use with medium heat equipment burning gas, liquid or solid fuels, as described in NFPA-37 and NFPA-211, which produce exhaust flue gas temperatures not exceeding 1400oF under continuous operating conditions. Additionally, the vent system shall be U.L. 103 positive pressure tested and listed to 60 inches internal water column pressure.

B. The U.L. listed fiber insulated exhaust system shall have skin temperatures that have been obtained by Underwriters Laboratories (UL) test procedures. The published surface temperatures shall be the result of the UL103 1000o Fahrenheit chimney test.

1:2 CONSTRUCTION

A. The double wall exhaust system shall have a 304 stainless steel inner liner (20 ga minimum) and an aluminized steel outer jacket (24 ga minimum). The materials and construction of the modular sections and accessories shall be as specified by the terms of the product’s U.L. listing.

1. Ceramic fiber insulation between the inner liner and outer jacket shall be a nominal two inches thick.

B. Aluminized steel surfaces exposed to the elements shall be protected by a minimum of one base coat of primer and one finish coat of corrosion resistant paint suitable for outer jacket skin temperatures of the given application. All primer and paint to be supplied by the installing contractor and shall be equivalent to series V2100 as manufactured by Rust-Oleum. Alternatively, an outer jacket constructed of 304 or 316 stainless steel may also be considered in lieu of painting.

C. This exhaust system shall be designed and installed to be gas tight and thus prevent leakage of combustion products into a building.

D. Inner pipe joints shall be securely connected and sealed with factory supplied over-lapping V-bands and appropriate sealant as specified in the manufacturer’s installation instructions.

E. Connections to silencers and expansion joints shall be made with matching flanges.  Matching flanges shall be of the same size, bolt hole spacing and pressure rating as the flanges to which the connections are made.

F. Roof penetrations shall be suitable for the specified roof construction and shall comply with the manufacturer’s installation instructions.

G. The exhaust system shall be designed to compensate for all flue gas induced thermal expansion.

PART-2: EXECUTION

2:1 INSTALLATION

A. Inner pipe joints shall be sealed by use of factory supplied overlapping V bands and sealant as specified in the manufacturer’s installation instructions.

B. Roof penetrations shall be suitable for a noncombustible roof and shall be according to the manufacturer’s detail drawings and installation instructions

C. When installed according to the manufacturer’s installation instructions, the exhaust piping and its supporting system shall resist side loads at least 1.5 times greater than the weight per foot of the piping for both horizontal and vertical portions of the system.

D. The exhaust system shall be installed according to the manufacturer’s installation instructions and shall conform to all applicable state and local codes.

E. Provide all supports, guides, bellows type expansion joints, pressure relief valves, guy sections, guy tensioners, roof thimbles, roof flashings, storm collars and flip top terminations as required to provide a complete system per the manufacturer’s installation instructions.

F.The entire exhaust system from the muffler discharge to the termination point, including all accessories, except as noted, shall be from one manufacturer.

PART-3: WARRANTY

3:1 WARRANTY

A. The exhaust system shall be warranted against functional failure due to defects in material and manufacturer’s workmanship for a period of 15 years from date of installation.

B. The inner diameter of the exhaust system shall be verified by the manufacturer’s computations. The computations used shall be technically sound, follow ASHRAE calculation methods and shall incorporate the specific flow characteristics of the inner pipe. The contractor shall furnish the exact operating characteristics of the engine(s) and muffler(s) to the factory representative.

C. The manufacturer shall provide “to scale” drawings depicting the actual layout. The exhaust system shall be installed as designed by the manufacturer and in accordance with the terms of the manufacturer’s warranty and in conjunction with sound engineering practices.

D. The factory built modular exhaust system shall be furnished by a vendor organization that assures design, installation and services coordination. As well as, providing “in-warranty” and “post-warranty” unified responsibility for owner, architect, consulting engineer and contractor.

PART-4:PRODUCTS

4.1  MANUFACTURERS

A. Product specification requirements shall be met by using Ampco Model-IVSI exhaust flue or equivalent as approved by the engineer. Equivalent submittals shall specify manufacturer’s model number, and other pertinent identification, and attest that the alternate material is in compliance with all specification requirements.

PART-1: KITCHEN HOOD EXHAUST

1:1: SCOPE

A. Provide factory built grease duct that is tested and listed by the Underwriters’ Laboratories, Inc. (UL 1978) for use with commercial cooking equipment, as described in NFPA-96.

B. The U.L. listed insulated grease duct shall be certified for zero clearance to combustible material per UL 2221 with a 2 hour fire rating and have a 1 hour fire rating per ASTM-E2336.  Hourly ratings are met with use of factory fire stop at necessary floor/wall penetrations.

1:2    CONSTRUCTION

A. The double wall exhaust system shall have a 304 stainless steel inner liner (20 ga minimum) and an aluminized steel outer jacket (24 ga minimum). The materials and construction of the modular sections and accessories shall be as specified by the terms of the product’s U.L. listing.

 B. 10 pound ceramic fiber insulation between the inner liner and outer jacket shall be a nominal three inches thick.

C. Aluminized steel surfaces exposed to the elements shall be protected by a minimum of one base coat of primer and one finish coat of corrosion resistant paint suitable for outer jacket skin temperatures of the given application. All primer and paint to be supplied by the installing contractor and shall be equivalent to series V2100 as manufactured by Rust-Oleum. Alternatively, an outer jacket constructed of 304 or 316 stainless steel may also be considered in lieu of painting.

D. This exhaust system shall be designed and installed to be liquid tight and thus prevent leakage of grease and/or grease laden vapors into a building.

E. Inner pipe joints shall be securely connected and sealed with factory supplied over-lapping V-bands and appropriate sealant as specified in the manufacturer’s installation instructions.

F. Each system shall be designed to provide access for inspection and cleaning of each change of duct direction, permit drainage of grease residue through a duct section, enable the system to allow for the thermal expansion and allow various types of fire suppression equipment to be integrated into the grease ductwork, as necessary per local code.

PART-2 EXECUTION

2:1: INSTALLATION

A. Inner pipe joints shall be sealed by use of factory supplied overlapping V bands and sealant as specified in the manufacturer’s installation instructions.

B. Roof penetrations shall be suitable for a noncombustible roof and shall be according to the manufacturer’s detail drawings and installation instructions.

C. When installed according to the manufacturer’s installation instructions, the exhaust piping and its supporting system shall resist side loads at least 1.5 times greater than the weight per foot of the piping for both horizontal and vertical portions of the system.

D. The exhaust system shall be installed according to the manufacturer’s installation instructions and shall conform to all applicable state and local codes.

E. Provide all supports, guides, expansion joints, guy sections, guy tensioners, roof thimbles, roof flashings, storm collars and flip top terminations as required to provide a complete system per the manufacturer’s installation instructions.

F. The entire exhaust system from hood to the termination point, including all accessories, except as noted, shall be from one manufacturer.

PART-3 WARRANTY

3:1-WARRANTY

A. The exhaust system shall have a limited lifetime warranty against functional failure due to defects in material and manufacturer’s workmanship from the date of installation.

B. The manufacturer shall provide “to scale” drawings depicting the actual layout. The exhaust system shall be installed as designed by the manufacturer and in accordance with the terms of the manufacturer’s warranty and in conjunction with sound engineering practices.

C. The factory built modular exhaust system shall be furnished by a vendor organization that assures design, installation and services coordination. As well as, providing “in-warranty” and “post-warranty” unified responsibility for owner, architect, consulting engineer and contractor.

PART-4 PRODUCTS

4.1:MANUFACTURERS

A. Product specification requirements shall be met by using Ampco IVSI ZClear exhaust flue or equivalent as approved by the engineer. Equivalent submittals shall specify manufacturer’s model number, and other pertinent identification, and attest that the alternate material is in compliance with all specification requirements.

PART-1: KITCHEN HOOD EXHAUST

1:1: SCOPE

A. Provide factory built grease duct that is tested and listed by the Underwriters’ Laboratories, Inc. (UL 1978) for use with commercial cooking equipment, as described in NFPA-96.

1:2    CONSTRUCTION

A. The single wall or double wall exhaust system shall have a 304 stainless steel inner liner (20 ga minimum) and an aluminized steel outer jacket (double wall & 24 ga minimum). The materials and construction of the modular sections and accessories shall be as specified by the terms of the product’s U.L. listing.

    1. Single wall and/or:
    2. Ceramic fiber insulation between the inner liner and outer jacket shall be a minimum of one inch thick and/or:
    3. Double wall air insulated exhaust system shall have a minimum one inch air space between the walls.

 B. Any combination of single wall and double wall air or blanket insulated exhaust may be used in conjunction as shown on the project plans

C. This exhaust system shall be designed and installed to be liquid tight and thus prevent leakage of grease and/or grease laden vapors into a building.

D. Inner pipe joints shall be securely connected and sealed with factory supplied over-lapping V-bands and appropriate sealant as specified in the manufacturer’s installation instructions.

E. Each system shall be designed to provide access for inspection and cleaning of each change of duct direction, permit drainage of grease residue through a duct section, enable the system to allow for the thermal expansion and allow various types of fire suppression equipment to be integrated into the grease ductwork, as necessary per local code

F. Aluminized steel surfaces exposed to the elements shall be protected by a minimum of one base coat of primer and one finish coat of corrosion resistant paint suitable for outer jacket skin temperatures of the given application. All primer and paint to be supplied by the installing contractor and shall be equivalent to series V2100 as manufactured by Rust-Oleum. Alternatively, an outer jacket constructed of 304 or 316 stainless steel may also be considered in lieu of painting.

PART-2 EXECUTION

2:1: INSTALLATION

A. Inner pipe joints shall be sealed by use of factory supplied overlapping V bands and sealant as specified in the manufacturer’s installation instructions.

B. Roof penetrations shall be suitable for a noncombustible roof and shall be according to the manufacturer’s detail drawings and installation instructions.

C. When installed according to the manufacturer’s installation instructions, the exhaust piping and its supporting system shall resist side loads at least 1.5 times greater than the weight per foot of the piping for both horizontal and vertical portions of the system.

D. The exhaust system shall be installed according to the manufacturer’s installation instructions and shall conform to all applicable state and local codes.

E. Provide all supports, guides, expansion joints, guy sections, guy tensioners, roof thimbles, roof flashings, storm collars and flip top terminations as required to provide a complete system per the manufacturer’s installation instructions.

F. The entire exhaust system from hood to the termination point, including all accessories, except as noted, shall be from one manufacturer.

PART-3 WARRANTY

3:1-WARRANTY

A. The exhaust system shall have a limited lifetime warranty against functional failure due to defects in material and manufacturer’s workmanship from the date of installation.

B. The manufacturer shall provide “to scale” drawings depicting the actual layout. The exhaust system shall be installed as designed by the manufacturer and in accordance with the terms of the manufacturer’s warranty and in conjunction with sound engineering practices.

C. The factory built modular exhaust system shall be furnished by a vendor organization that assures design, installation and services coordination. As well as, providing “in-warranty” and “post-warranty” unified responsibility for owner, architect, consulting engineer and contractor.

PART-4 PRODUCTS

4.1:MANUFACTURERS

A. Product specification requirements shall be met by using Ampco Model(s) N (single wall), VSI (air) or IVSI (blanket) exhaust flue or equivalent as approved by the engineer. Equivalent submittals shall specify manufacturer’s model number, and other pertinent identification, and attest that the alternate material is in compliance with all specification requirements