PROPERTY ASTM TEST METHOD ALPHASONIC RATINGWeight ! 12 lbs.Length, inches ! 47 5/8Width, inches ! 23 3/4Flange width, inches ! 1 nominalDepth, peak to peak, inches ! 4 1/4 maximum

Dielectric strength, volts D149 56,000 minimumLight transmission, % ! 87Refractive index D542 1.47Specific gravity D792 1.2Flammability, panel/wedge D635/UL94HEF-1 PassedWater absorption, 24 hrs, % D570 1.6

Impact, falling dart, FT-lbs ! 39Thermal expansion, in/in/EF D696 8.00E-05FDA Acceptable FDA 121.2510/177.1640 Yes.Not recommended for use with: Acetone, Benzene, Carbon tetrachloride or oxidizing agents

FREQUENCY, Hertz(cps) TRANSMISSION LOSS, dB ABSORPTION COEFFICIENT %100 22125 23160 12200 15250 16315 17400 18500 21630 27800 311000 351250 371600 382000 382500 403150 444000 455000 47

NRC* 0.78 FSTC 27*NRC is the average of coefficients from 250 Hz to 2K Hz. Maximum is 0.95 Test panels joined by aluminum "H" connector and sealedwith acrylic rubber. Tested per ASTM E 336-71, ASTM E 413-70T and ASTM C 423-66.Designs and specifications contained herein are subject to change without notice.

Continuous service temperature, EF ! 150 maximum

Thermal conductivity (U factor), BTU - in/sq ft - hr. EF ! 1.74

95

94

38

43

61

112

Engineered Aeroacoustics, Inc., 2711 Nevada Avenue North, Minneapolis, Minnesota 55427-2806 Telephone: 763-535-0102, Facsimile: 763-535-0131

Engineered Aeroacoustics, Inc., 2711 Nevada Avenue North, Minneapolis, Minnesota 55427-2806 Telephone: 763-535-0102, Facsimile: 763-535-0131

57901-2

Stop Noise Economically . . .

and Safely With Alphasonic® Acoustical Panels Transparent panels also act as safety shield. Work process is always visible.

The Alphasonic® Noise Control System offers a new approach to noise abatement. Alphasonic® panels* and prefabricated framing will adapt to any desired configuration. This creates an effective noise barrier which is transparent, lightweight, portable and fully functional as a machine guard. With modular construction, every Alphasonic® panel is independently accessible for easy removal, or, in large assemblies for rapid dismantling. Panels and framing may be removed without disturbing adjoining components. Costly ventilation and cooling systems are usually not required due to the panels intrinsically high thermal conductivity. Now with increased government regulations and company awareness of employee safety, it is more important than ever before to be aware of proper methods of shielding workers from possible injury. Low cost Alphasonic® panels are rigid, transparent sheets formed into parabolic sinusoidal contours where sound energy is reflected and concentrated along a media strip. The diffusion, absorption and sound wave interference results in extremely high acoustical performance. Alphasonic® panels react to noise the same way a solar collector reacts to light.

Fast Installation Alphasonic® panels may be easily cut or drilled with ordinary hand tools. An integral flange makes the unit easy to mount, hinge, slide or join into larger barriers or total enclosures. Units can be enlarged or reduced in size in six-inch increments to completely enclose any undesirable noise source such as can and bottle canning lines, feed enclosures, machine and metal stock guards, etc. Panels Meet Current Regulations Alphasonic® panels are not affected by most industrial chemicals and solvents and meet current FDA and USDA requirements. Because of the contoured design of the panels there are no cracks or crevices to accumulate dirt and other foreign matter. Each unit or the entire system may be washed down or steam cleaned to sterilize. In addition Alphasonic® acoustic panel systems generally require no ventilation as the panels are designed to dissipate heat.