Sound Control

From highway and railway noise, to airports and general noise pollution, Atrium Silent Guard Windows are the superior choice for new construction and renovation projects in single family and multifamily/light commercial applications.

Through extensive research and development, Silent Guard Windows can help mitigate against a broad spectrum of noise ordinances and code compliance including STC (Sound Transmission Class), EWR/EWNR (Exterior Wall Noise Reduction), OITC (Outdoor-Indoor Transmission Class).

STC (Sound Transmission Class)

This rating was first published in 1970 in accordance with ASTM E413, and was designed to provide a performance rating for interior wall partitions against noises from speech, television, radio and office equipment. It is important to note that ASTM E413 specifically states that the STC calculation should not be used to evaluate partitions exposed to transportation noise such as motor vehicles, aircraft and trains.

EWR/EWNR (Exterior Wall Noise Reduction)

This rating was developed in 1977 by Wyle Laboratories for the U. S. Department of Transportation, Federal Highway Administration. It is similar to the STC rating, but, unlike the STC rating, it is designed to provide a performance rating for building facades that are exposed to transportation (traffic) noise.

OITC (Outdoor-Indoor Transmission Class)

This rating was first published in 1990 in accordance with ASTM E1332, and was designed to provide a performance rating for exterior facades and facade elements (windows and doors) that are subjected to transportation noise such as motor vehicles, aircraft and trains. The OITC rating can be assigned to specimens tested in the field and in the laboratory.