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