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The absorption coefficient data was measured
without any spacing between the FlutterFree planks. 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). For extended low
frequency absorption the FlutterFree Helmholtz
mounting may be used in conjunction with the slotted planks.
| Mount: |
Surface |
Cavity |
| Slot Width |
1/4" (6.35 mm) |
1/4" (6.35 mm) |
| Slot Spacing |
1.125" (28.6 mm) oc
|
1.125" (28.6 mm) oc |
| 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 |
none |
3.5" (89 mm) |
| Total Thickness |
2" (51 mm) |
5.5" (140 mm) |
| Hz |
Absorption Coefficient |
| 100 |
0.1 |
0.35 |
| 125 |
0.08 |
0.41 |
| 160 |
0.14 |
0.43 |
| 200 |
0.21 |
0.6 |
| 250 |
0.32 |
0.77 |
| 315 |
0.62 |
0.97 |
| 400 |
0.85 |
1.01 |
| 500 |
1.17 |
0.91 |
| 630 |
1.09 |
0.83 |
| 800 |
0.81 |
0.71 |
| 1000 |
0.58 |
0.61 |
| 1250 |
0.45 |
0.55 |
| 1600 |
0.38 |
0.5 |
| 2000 |
0.34 |
0.42 |
| 2500 |
0.32 |
0.38 |
| 3150 |
0.33 |
0.38 |
| 4000 |
0.43 |
0.44 |
| 5000 |
0.48 |
0.49 |
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Products:
FlutterFree®
Slotted FlutterFree Absorption Coefficients
| Slotted
FlutterFree Mounting Arrangement |
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