These requirements apply to materials for the fabrication of air duct and
air connector systems for use in accordance with the International
Mechanical Code (IMC), International Residential Code (IRC), and Uniform
Mechanical Code (UMC), Standards of the National Fire Protection
Association for the Installation of Air-Conditioning and Ventilating Systems,
NFPA No. 90A, and the Installation of Warm Air Heating and Air-Conditioning
Systems, NFPA No. 90B.
1.2 The air ducts and air connectors covered by these requirements include
preformed lengths of flexible or rigid ducts, materials in the form of boards for
field fabrication of lengths of rigid ducts, and preformed flexible air connectors.
1.3 For the purpose of these requirements, air ducts and air connectors are
classified as follows:
Class 0 - Air ducts and air connectors having surface burning characteristics
of zero.
Class 1 - Air ducts and air connectors having a flame-spread index of not over
25 without evidence of continued progressive combustion and a smokedeveloped
index of not over 50
These requirements apply to materials for the fabrication of air duct and
air connector systems for use in accordance with the International
Mechanical Code (IMC), International Residential Code (IRC), and Uniform
Mechanical Code (UMC), Standards of the National Fire Protection
Association for the Installation of Air-Conditioning and Ventilating Systems,
NFPA No. 90A, and the Installation of Warm Air Heating and Air-Conditioning
Systems, NFPA No. 90B.
1.2 The air ducts and air connectors covered by these requirements include
preformed lengths of flexible or rigid ducts, materials in the form of boards for
field fabrication of lengths of rigid ducts, and preformed flexible air connectors.
1.3 For the purpose of these requirements, air ducts and air connectors are
classified as follows:
Class 0 - Air ducts and air connectors having surface burning characteristics
of zero.
Class 1 - Air ducts and air connectors having a flame-spread index of not over
25 without evidence of continued progressive combustion and a smokedeveloped
index of not over 50
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