Grid pattern 2Wx4H flankers; 4Wx4H center. No maintenance vinyl construction. Energy efficient 3/4" Low-E insulated glass. White. Single-hung flankers. Screens included. Rough opening 81-1/2" x 50-1/2". Headboard and seatboard attached. window projection is 12-1/2" from nail fin to outer face. Lifetime warranty. Also available, preformed polymer roof for easy installation. Also available, optional support brackets.