St Cloud Window Inc. announces a new SCW4000 Series window. This AW-PG70 window has a narrow 4-inch frame depth, polyamide thermal barrier, accommodates insulating glass up to 1.25 inches with certified acoustic performance STC 28-51, OITC 22-42, and U-values to 0.35. Designed to accommodate the increasing demand for acoustic performance and high thermal efficiency to both buildings and occupants and is available in a vertical sliding, horizontal sliding and fixed configuration.