Intended for medium- and low-rise commercial buildings, 400TU Series combines aluminum framing, dual thermal strut, and insulated glass. Dual-glazed product, which achieves U-Factors of 0.30 for thermal transmittance and frame condensation resistance factor of 81, meets or exceeds ASTM and AAMA industry standards for air, water, structural, thermal, acoustical, and seismic performance. System is also tested to meet acoustical performance ratings for Sound Transmission Class 38 and OITC 32.