Marvin Essential Collection double casement window unit featuring two side-by-side casement sashes in a single white fiberglass frame with dark exterior flange/nailing fin. Glazing: Low-E3/ERS insulating glass with 11/16" IG unit (3.1mm glass / 11.5mm air space / 3.1mm glass). ENERGY STAR certified. NFRC and WDMA Hallmark certified. Energy performance ratings: U-Factor 0.28, Solar Heat Gain Coefficient 0.19, Visible Transmittance 0.43. Crank operators at the bottom of each sash. Overall unit size: 72"W x 42"H. New/unused condition — original stickers and protective film on glass still present.