Noise Control Products


Sound Transmission Class (STC) is an architectural rating that describes the sound isolation performance of wall assemblies. When penetration of an acoustically rated wall is required for ventilation systems, STC Silencers ensure the sound isolation performance of the wall is not compromized.

STC Outer Casing Air Pass Dim. Length
40 10ga HTL 6" (152) 72" (1829)
45 10ga HTL 6" (152) 96" (2438)
50 2" (51) Dbl. Wall 6" (152) 120" (3058)

Maximum air passage describes the free area clearance between
baffles where physical security measures may be required.

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