Tubelite Inc. added a new 900RW Series ribbon windows, with single and dual poured and debridged thermal options, as part of its growing Therml=Block product line. Tubelite’s 900RW ribbon windows have been successfully tested per the National Fenestration Council (NFRC) 102-14 procedure, achieving a U-Factor of 0.30 for thermal transmittance. They also successfully were tested per the American Architectural Manufacturers Association (AAMA) 1503-09 standard, achieving a frame condensation resistance factor (CRFf) of 72. The single and dual thermal break options allow designers to select appropriate thermal performance levels to meet their projects’ requirements.