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Home > Products > Custom Products > Acoustical Duct Liner > Technical Specifications
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Acoustical Duct Liner Technical Specifications
Insertion Loss
| willduct, natural, 1" thick - Insertion Loss (dB/ft) per ASTM E477-99 |
| Flow Direction |
Flow (FPM) |
P.D.
(in w.c.) |
63 Hz |
125 Hz |
250 Hz |
500 Hz |
1 kHz |
2 kHz |
4 kHz |
8 kHz |
| Forward Flow |
0 |
0.000 |
0.00 |
0.12 |
0.49 |
2.18 |
4.37 |
2.66 |
2.22 |
2.26 |
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1000 |
0.024 |
0.00 |
0.13 |
0.45 |
2.10 |
4.32 |
2.67 |
2.29 |
2.25 |
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2000 |
0.094 |
0.00 |
0.09 |
0.43 |
2.05 |
4.30 |
2.77 |
2.35 |
2.23 |
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2500 |
0.148 |
0.00 |
0.04 |
0.40 |
2.00 |
4.28 |
2.73 |
2.32 |
2.22 |
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| willduct, natural, 1" thick - Insertion Loss (dB/ft) per ASTM E477-99 |
| Flow Direction |
Flow (FPM) |
P.D.
(in w.c.) |
63 Hz |
125 Hz |
250 Hz |
500 Hz |
1 kHz |
2 kHz |
4 kHz |
8 kHz |
| Reverse Flow |
1000 |
0.000 |
0.00 |
0.21 |
0.52 |
2.25 |
4.37 |
2.55 |
2.29 |
2.12 |
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2000 |
0.094 |
0.00 |
0.20 |
0.65 |
2.39 |
4.32 |
2.66 |
2.33 |
1.97 |
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2500 |
0.148 |
0.00 |
0.20 |
0.69 |
2.44 |
4.39 |
2.75 |
2.31 |
1.91 |
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| willduct, Hypalon®-coated, 1" thick - Insertion Loss (dB/ft) per ASTM E477-99 |
| Flow Direction |
Flow (FPM) |
P.D.
(in w.c.) |
63 Hz |
125 Hz |
250 Hz |
500 Hz |
1 kHz |
2 kHz |
4 kHz |
8 kHz |
| Forward Flow |
0 |
0.000 |
0.12 |
0.21 |
0.56 |
2.31 |
4.45 |
2.79 |
2.40 |
2.26 |
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1000 |
0.024 |
0.04 |
0.11 |
0.46 |
2.22 |
4.39 |
2.61 |
2.48 |
2.36 |
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2000 |
0.094 |
0.00 |
0.13 |
0.46 |
2.18 |
4.35 |
2.86 |
2.49 |
2.30 |
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2500 |
0.148 |
0.03 |
0.10 |
0.43 |
2.13 |
4.30 |
2.92 |
2.52 |
2.27 |
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| willduct, Hypalon-coated, 1" thick - Insertion Loss (dB/ft) per ASTM E477-99 |
| Flow Direction |
Flow (FPM) |
P.D.
(in w.c.) |
63 Hz |
125 Hz |
250 Hz |
500 Hz |
1 kHz |
2 kHz |
4 kHz |
8 kHz |
| Forward Flow |
1000 |
0.000 |
0.15 |
0.22 |
0.57 |
2.38 |
4.50 |
2.77 |
2.36 |
2.15 |
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2000 |
0.094 |
0.20 |
0.22 |
0.61 |
2.47 |
4.57 |
2.79 |
2.39 |
2.04 |
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2500 |
0.148 |
0.23 |
0.25 |
0.66 |
2.55 |
4.54 |
2.66 |
2.40 |
1.96 |
Sound Absorption Coefficients
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| willduct |
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Sound Absorption Coefficients per ASTM C423-90a |
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Mounting |
| Surface |
Thickness |
125 Hz |
250 Hz |
500 Hz |
1 kHz |
2 kHz |
4 kHz |
NRC |
Type |
| Natural |
1" |
0.05 |
0.18 |
0.53 |
0.85 |
0.95 |
1.00 |
0.65 |
A |
| Hypalon coated |
1" |
0.07 |
0.25 |
0.71 |
1.06 |
1.10 |
1.00 |
0.80 |
A |
Physical Data - willtec Foam
| Material |
Open-cell melamine-based foam |
| Density |
0.5 to 0.7 lbs./cubic ft. (ASTM D3574-77) |
| Long-Term Service Temperaturee |
302 degrees F |
| Air Erosion Evaluation |
Complies with requirements of UL 181, section 16 |
| Fire Resistance |
Class 1 per ASTM E 84 (all finishes) and NFPA 255 |
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Meets requirements of UL 181, section 9 Burning Test |
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Meets UL 1715 (willtec natural) |
| Flame Spread per ASTM E 84 |
Natural: 5 |
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Hypalon-coated: 25 |
| Smoke Density per ASTM E 84 |
Natural: 50 |
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Hypalon-coated: 65 |
| Microbial Growth |
Passes UL 181, section 11 |
| Fungus Resistance |
Rating #0 per ASTM G21 |
| Finishes |
Natural White or Grey or Hypalon-coated |
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