1.1 This test specification describes the sound
transmission loss measurement procedure for windows,
doors and glazed wall sections.
1.2 The Sound Transmission Class (STC) and Outdoor-
Indoor Transmission Class (OITC) ratings are generated
from the sound transmission loss test data.
1.3 Air infiltration, operating force and latching force are
integral elements of the acoustical performance of the
tested unit and are therefore required in the product's
performance evaluation, where applicable.
1.4 This scope excludes any interior window or door
assemblies.
1.5 The primary units of measure in this document are
metric. The values stated in SI units are to be regarded as
the standard. The values given in parentheses are for
reference only.