MicroFiber Glass Wool Insulation with Perforated Foil PFL Duct Liner

Micro Duct Liner MicroFiber Micro Duct Liner glass wool insulation is designed for internal duct installation. It reduces air noise within ducts and can operate at temperatures up to 120°C with airflow speeds of 5,000 fpm (25.4 m/s) without erosion, tested according to UL 181 Erosion Test standards. Maintaining Cool Air in Ducts Air temperature inside ducts is low at 13-15°C while outside temperature is higher at 25-30°C, causing heat exchange at the duct surface. Therefore, insulation is needed both inside and outside the duct to reduce heat transfer and maintain cool air until distribution. Condensation Prevention Condensation is common in air conditioning systems due to temperature differences between cold air inside ducts and warmer air outside. When warm external air contacts the cold duct surface, water droplets form on the duct surface. Insulated cooling ducts prevent surface condensation Similar to a glass containing ice developing condensation on its surface, or when insulated ducts still show condensation due to insufficient insulation thickness, extremely cold internal air, or very hot surrounding temperatures. Acoustic Properties The main purpose of Micro Duct Liner insulation is to absorb noise generated within air ducts from high air velocity. The porous nature of glass wool insulation absorbs sound waves upon impact with the insulation surface. Sound Absorption Coefficients (SAC) indicate the percentage of sound absorbed versus reflected. For example, PFL 3225 at 2000 Hz has SAC = 0.93, meaning 93% absorption and 7% reflection. SAC values vary with sound frequency   Noise Reduction Coefficient (NRC) คือ is the average of SAC values at 250Hz, 500Hz, 1000Hz, and 2000Hz. An NRC of 0.9 means the material absorbs approximately 90% of sound on average. NRC is the material’s average total value Sound Absorption Coefficients (Type “A” Mounting) Product Type Thickness (mm.) Sound Absorption Coefficients, ASTM C423 (Type A Mounting) Octave Band Center Frequencies (Hz) 125 250 500 1000 2000 4000 NRC PFL 3225 25 0.00 0.25 0.74 0.92 0.93 1.00 0.70 PFL 3250 50 0.12 0.44 1.02 1.07 0.84 0.78 0.85 PFL 4825 25 0.02 0.27 0.73 1.04 1.05 0.88 0.80 GTS 4850 50 0.20 0.86 1.12 1.07 1.01 0.99 1.00 GLC 4825 25 0.06 0.33 0.66 1.08 0.94 0.85 0.75 GLC 4850 50 0.24 0.90 1.11 1.11 1.03 1.01 1.05 Surface Materials for Micro Duct Liner Glass Wool Perforated Foil (PFL) surface finish Glass Tissue (GTS) surface finish Glass Cloth (GLC) surface finish Product Size Table Micro Duct Liner Size Chart Density (Kg/m3) Thickness (mm) Size (W x L) 32 25 1.22 x 2.44 50 1.22 x 2.44 40 25 1.22 x 2.44 50 1.22 x 2.44 Technical Data Table Features MicroCover Test Standard Operating Temperature 121°C ASTM C 411 Density 32 kg/m3, 40 kg/m3 Water Vapor Absorption < 1.0% at 49°C, 95% RH ASTM C1104 Mold and Fungus Growth Does not promote mold and fungus growth ASTM C665