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What product(s) are you aware of that meets these requirements between dwelling units?
1207.2 Air-borne sound. Walls, partitions and floor/ceilingassemblies separating dwelling units from each other or frompublic or service areas shall have a sound transmission class
(STC) of not less than 50 (45 if field tested) for air-borne
noise when tested in accordance with ASTM E 90. Penetrations
or openings in construction assemblies for piping; electrical
devices; recessed cabinets; bathtubs; soffits; or heating,
ventilating or exhaust ducts shall be sealed, lined, insulated or
otherwise treated to maintain the required ratings. This
requirement shall not apply to dwelling unit entrance doors;
however, such doors shall be tight fitting to the frame and sills.