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The absorption coefficient data is for non-slotted
FlutterFree in a Hemlholtz mounting. Surface mount refers to a C mounting
with fiberglass on the boundary. The Cavity mount refers to a D mounting
with a cavity depth of 3.5" (89 mm). The spacing between FlutterFreeŽ
strips is 0.063" with a fractional open area of 0.015.
| Mount: |
Surface |
Cavity |
| Slot Width |
1/16" (1.6 mm) |
1/16" (1.6 mm) |
| FlutterFree Width |
1" (25.4 mm) |
1" (25.4 mm) |
| FlutterFree Thickness |
1" (25.4 mm) |
1" (25.4 mm) |
| Backing |
1" (25.4mm) 6 pcf
Fiberglass |
1" (25.4mm) 6 pcf
Fiberglass |
| Cavity Depth |
0 |
3.5" (89 mm) |
| Total Thickness |
2" (51 mm) |
5.5" (140 mm) |
| Hz |
Absorption Coefficient |
| 100 |
0.19 |
0.51 |
| 125 |
0.34 |
0.76 |
| 160 |
0.44 |
0.58 |
| 200 |
0.75 |
0.52 |
| 250 |
0.69 |
0.4 |
| 315 |
0.47 |
0.31 |
| 400 |
0.37 |
0.28 |
| 500 |
0.26 |
0.23 |
| 630 |
0.22 |
0.21 |
| 800 |
0.15 |
0.16 |
| 1000 |
0.12 |
0.16 |
| 1250 |
0.11 |
0.15 |
| 1600 |
0.11 |
0.15 |
| 2000 |
0.14 |
0.18 |
| 2500 |
0.22 |
0.24 |
| 3150 |
0.17 |
0.21 |
| 4000 |
0.16 |
0.22 |
| 5000 |
0.15 |
0.18 |
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FlutterFree®
Non-slotted Absorption Coefficients
| Mounting
Arrangement |
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