The series 3900 window is a 3-1/4" deep fixed window designed for commercial, local government, and education applications. The 3900 utilizes a urethane thermal barrier, combined with ultra-low air infiltration, to enhance occupant comfort and energy savings. Offered with a complete line of subframes, mullions, and architectural sills, the series 3900 is a flexible option in today's retrofit and new construction markets. AAMA RATING ^ * Performance dependent on glass selection. Please contact your EFCO sales rep for project specific performance. STANDARD FEATURES • System depth: 3-1/4" • Mulls to products of the same system depth • Nominal wall thickness: 0.090" • Anodized and painted finishes available • Glass thickness range: 1" - 2-3/4" • Panning/Trim: Available • Subframe/Receptor system: Available • Architectural sills: Available • Mullions: ■ 3 piece mullions ■ Stacking mullions 1000 COUNTY RD • MONETT, MO 65708 • 800.221.4169 • efcocorp.com Disclaimer: Info subject to change at any time