Morris Products 20984 Air Handling Cable Ties For Plenum Areas, 11.8" Length, 0.19" Width, Tensile Strength, 3" Max Bundle Diameter (Pack of 100) Air Handling Cable Ties For Plenum Areas - Air Handling Zip Cable Ties are safe and code compliant. Air handling zip cable ties meet UL 2043 for use in air handling spaces Generates low smoke & offers low heat release Burgundy Color 50 Lb. Tensile strength