Wood One Dimensional Flutter Control Molding
A The Wood One Dimensional Flutter Control Molding shall be the model FlutterFree® as manufactured by RPG Diffusor Systems, Inc., Upper Marlboro, MD 20774. Tel: 301-249-0044, Fax: 301-249-3912.
B The Wood One Dimensional Flutter Control Molding shall be fabricated from solid hardwood birch (or select other suitable hardwood).
C The Wood One Dimensional Flutter Control Molding shall work on the one dimensional reflection phase grating principle, using an array of wells of equal width separated by thin dividers. The depths of the wells for each nested diffusor shall be based on the prime seven quadratic residue theory sequence.
D Flutter control in the horizontal plane shall be provided by wells in the vertical position while flutter control in the vertical plane shall be provided by wells in the horizontal position. The Wood One Dimensional Flutter Control Molding may be rotated to achieve a variety of patterns that will provide a highly effective scattering surface.
E Absorption Coefficients and Noise Reduction Coefficient for the product shall be measured by an independent, accredited NVLAP facility according to the test methods as defined by ASTM C 423 and ASTM E 795. Random incidence Absorption Coefficients for the product in an E-400 mounting shall be as follows:
| 125Hz | 250Hz | 500Hz | 1000Hz | 2000Hz | 4000Hz | NRC |
| 0.23 | 0.24 | 0.35 | 0.23 | 0.20 | 0.20 | 0.25 |
F Diffusion Coefficients for the product shall be measured in accordance with AES-4id-2001. The normal incidence diffusion coefficients are listed below at octave-band centers. The mean and standard deviation (
)
of the 1/3-octave-band coefficients are also tabulated. | 1000Hz | 2000Hz | 4000Hz | 8000Hz | 16000Hz | MEAN | SD |
| 0.61 | 0.68 | 0.77 | 0.72 | 0.73 | 0.69 | 0.06 |
G Flame Spread and Smoke Developed shall be tested by an independent, accredited NVLAP facility according to the test methods as defined by ASTM E 84 and NFPA 255. If a Class A finish is required, the Wood One Dimensional Flutter Control Molding shall be finished with an intumescent coating to achieve a Flame Spread Rating of less than 25 and a Smoke Development of less than 450.
H The Wood One Dimensional Flutter Control Molding shall be supplied with a standard lacquered finish (or select other suitable finish).
I The overall dimensions shall be 1'(H) x 3-15/16"(W) x 1-1/16"(D) and weigh no more than 1 pound per linear foot.
CSI Specifications
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Copyright
2000, RPG Diffusor Systems, Inc. |