B
APPENDIX B
UL 181 TEST SECTIONS
Test
Air Ducts
Air Connectors
Surface Burning Characteristics 1
x
x
Flame Penetration
x
-
Burning
x
x
Corrosion a
x
x
Mold Growth and Humidity
x
x
Temperature
x
x
Puncture
x
-
x b
x b
Static Load
Impact
x
-
Erosion 2
x
x
Pressure 2
x
x
Collapse 2
x
x
33
Tension
x
x
Torsion
x
x
Bending
x
x
Leakage
x
x
Listing Label Shape
Rectangular
Round
X
Test applicable
-
Test not applicable
a
Applicable to parts of metals not inherently corrosion resistant.
b Test applicable for flexible air ducts and air connectors that incorporate vapor barriers supported by grommets or other means of field support.
Footnote 1 Tests for surface burning characteristics are to be conducted as specified for Surface Burning Characteristics of Building Materials, UL 723 (ASTM E84, NFPA 255).
Class 0 Material: Shall have surface burning characteristics of zero (flame spread/smoke developed).
Class 1 Material: Shall have flame spread rating of not over 25 without evidence of continued progressive combustion and a smoke - developed rating of not over 50.
Footnote 2 These three tests, Pressure, Erosion and Collapse, are run at 2.5 times the manufacturer ’ s stated rating for that property. For the erosion test, the variable is velocity; for the pressure test the variable is positive pressure; for the collapse test, the variable is negative pressure.
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