Frame Depth = 3-1/4″ AAMA CW-PG50 / C60 Insulated Glass Unit Depth = 7/8″~ for optimum insulation & sound reduction. PPG “Intercept” Insulated Glass Spacer ~ the “warm-edge” technology of choice. Tilt Sashes ~ for safe, easy cleaning of both top and bottom sashes. Sloped Sill Anti-Drift Head Clip Lock ~ automatically secures the top sash in the closed position for safety, security, and a weathertight seal. Additional Product Documents Series 2100 Heavy Commercial / Architectural Aluminum Thermal-Break Picture / Fixed Windows Series 2100 Heavy Commercial / Architectural Aluminum Thermal-Break Picture / Fixed Windows Frame Depth: 3-1/4″ AAMA Rating: CW-PG60 Insulated Glass Unit Depth = 7/8″ – Enhanced insulation & sound reduction. Double Strength Glass Maximum Daylight / Glass with Minimum Frame AAMA 2604 Powder Coat Finish – The durable finish that’s also environmentally-friendly.