model STC 40/45/50sound transmission class silencer

certified performance data

How to schedule:

W x H x L STC-45width height length sound transmission class rating

Performance OptionsFill Material: o Fiberglass o Recycled Cotton Fill Protection: o None

Construction OptionsMaterials: o Galvanized Steel o 304 Stainless Steel o 316 Stainless SteelCasing Gauge: o 22 Gauge (standard) o 18 Gauge o 16 GaugePerforated Gauge: o 26 Gauge (standard) o 22 Gauge High Transmission Loss (HTL) Casing: o 10 Gauge (STC 40, 45) o 2" (51) Double Wall (STC 50) Connections: Inlet o 1" (25) Slip o S & Drive o Angle Flange o 1x1x8 o 2x2x1/4 o 3x3x1/4 o Continuously Welded

Outlet o 1" (25) Slip o S & Drive o Angle Flange o 1x1x8 o 2x2x1/4 o 3x3x1/4 o Continuously Welded

Performance Notes1. Information is subject to change without notice or obligation.2. Dimensions in parenthesis () are millimeters.3. Data derived from independent laboratory tests in accordance with ASTM E477-13. 4. “+” indicates forward flow. (supply), “-” indicates reverse flow. (return)5. Maximum differential pressure: 8 in. wg. 6. Generated noise data is based on a face area of 4 ft

2. For each doubling of face area add 3 dB to the self-generated noise values.

7. Pressure drops reported in accordance with ASTM E477-13 and are based on ideal flow conditions (5 duct diameters upstream and 10 downstream). Less than ideal conditions will result in an increase in pressure drop due to system effects.

5101 Blue Mound Road, Fort Worth, Texas 76106 • PH: 817-509-2300 www.pottorff.com

Lengthinches (mm)

STC-4072(1829)

STC-4596(2438)

STC-50120(3048)

PressureDrop

in. wg (Pa)

FaceVelocityfpm (m/s)

Insertion Loss (dB)Octave Band Center Frequency (Hz)

1 2 3 4 5 6 7 863 125 250 500 1K 2K 4K 8K

1 2 3 4 5 6 7 863 125 250 500 1K 2K 4K 8K

Generated Noise LW (dB; 1012 Watts)Octave Band Center Frequency (Hz)

0.37 (92)0.17 (42)0.00 (0)0.17 (42)0.37 (92)

1091088

1716161414

3737353332

4645464544

4950505049

4553535347

4848484948

3131333434

- 750 (-3.8)- 500 (-2.5)0.00 (0)

+500 (2.5)+750 (3.8)

0.4 (100)0.17 (42)0.00 (0)0.17 (42)0.4 (100)0.32 (80)0.15 (37)0.00 (0)0.15 (37)0.32 (80)

1413121111

2424211919

4543424039

4948504949

5252535348

5353535348

5151515150

3434363738

2020181817

2727242222

4544434140

5454545454

5254545452

5254545452

5454555554

3535363637

5754-5557

4441-4757

3529-4250

4034-4249

4736-4250

5231-3749

4123-2944

3330-3034

5755-5356

4645-4247

3428-3544

3831-3847

4329-3849

4222-3148

3222-2443

3029-2934

6361-6263

5248-4655

4438-3542

4638-3542

4637-3545

4228-2642

3222-2235

2929-2929

- 750 (-3.8)- 500 (-2.5)0.00 (0)

+500 (2.5)+750 (3.8)- 750 (-3.8)- 500 (-2.5)0.00 (0)

+500 (2.5)+750 (+3.8)

sound transmission class silencer STC August 2014

STC-50

STC-40, 45