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Karp is pleased to introduce our newly redesigned STC Acoustical Access Door - Tested in accordance with ASTM: E1332, ASTM: E90, and ASTM: E413, now has an STC rating of 64 – THE HIGHEST RATING IN THE CATEGORY! Karp’s STC acoustical access door is designed to reduce sound transmission and contain noise associated with mechanical systems and everyday environmental noises. Karp’s redesigned STC access door is perfect for hi-rise residential areas, judicial settings, teaching settings, and more!