NFPA 90A (Standard for the Installation of Air Condition and Ventilating Systems), deals with
the use of materials associated with ducts, plenums and other air handling units, including insulation in or on
ducts. Section 2-3.3 (Supplementary Materials for Air Distribution Systems) of the specification relates to
insulation materials.
Section: 2-3.3.1 states “Supplementary materials such as duct coverings, duct linings, vapor barrier facings,
adhesives, fasteners, tapes, and core materials added to air ducts, plenums, panels, and duct silencers used in
duct systems shall have a flame spread rating not over 25 without evidence of continued progressive
combustion and a smoke developed rating no higher than 50.”
Section: 2-3.3.2 states “Air duct, panel, and plenum coverings and liners shall not flame, glow, smolder, or
smoke when tested in accordance with similar test for pipe covering. ASTM C411, Standard Test Method for
Hot Surface Performance of High Temperature Thermal Insulation, at the temperature to which they are
exposed in service. In no case shall the test temperature be below 250°F (121°C).
In later sections the standard goes into more detail regarding materials specifically used as pipe insulation and
coverings (Section 2-3.3.6) where reference is made to Sections 2-3.3.1 and 2-3.3.2.
NFPA 90A (Standard for the Installation of Air Condition and Ventilating Systems), deals with
the use of materials associated with ducts, plenums and other air handling units, including insulation in or on
ducts. Section 2-3.3 (Supplementary Materials for Air Distribution Systems) of the specification relates to
insulation materials.
Section: 2-3.3.1 states “Supplementary materials such as duct coverings, duct linings, vapor barrier facings,
adhesives, fasteners, tapes, and core materials added to air ducts, plenums, panels, and duct silencers used in
duct systems shall have a flame spread rating not over 25 without evidence of continued progressive
combustion and a smoke developed rating no higher than 50.”
Section: 2-3.3.2 states “Air duct, panel, and plenum coverings and liners shall not flame, glow, smolder, or
smoke when tested in accordance with similar test for pipe covering. ASTM C411, Standard Test Method for
Hot Surface Performance of High Temperature Thermal Insulation, at the temperature to which they are
exposed in service. In no case shall the test temperature be below 250°F (121°C).
In later sections the standard goes into more detail regarding materials specifically used as pipe insulation and
coverings (Section 2-3.3.6) where reference is made to Sections 2-3.3.1 and 2-3.3.2.
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