What is an STC rating?

STC stands for Sound Transmission Class.

An STC (Sound Transmission Class) is a single number rating system derived from measured values of sound transmission loss in accordance with ASTM E90 and E413 Classification . An STC rating provides a standard industry accepted method for comparing the sound reduction effectiveness of various sound doors and windows.

Steelcraft doors are STC rated but are not considered to be "Acoustical" doors. Acoustical doors usually carry a STC rating of 50 or above.


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