Extra thick fan and pile weatherstripping seals out elements. Standard R-Core® polyurethane-filled mainframes for improved thermal properties. Add optional sash R-Core® for maximum insulating values. Optional Hi R+Plus® and Maxuus™ glass systems enhance thermal performance and lower your utility costs. Windows featuring our Hi R+Plus® and Maxuus™ glass options earn the ENERGY STAR by meeting strict energy efficiency guidelines set by the U.S. Environmental Protection Agency and the U.S. Department of Energy. Full 7/8" Warm -edge Intercept® insulated glass is standard on most products and provides greater comfort and strength.

Fusion-welded sash and frames provide maximum strength – guaranteed to never loosen or separate. Heavy-duty track and roller system for long life and easy rolling. Durable hardware is guaranteed for life.

Flush-mounted cam-action sash locks can't be seen from outside for added security and beautiful styling. Interior glazing bead deters glass removal from outside the home and provides a waterproof seal to protect insulating glass. Ventilation limiti-locks add security yet allow windows to remain partially open.

Sash are removable from inside the home to allow safe, easy cleaning. Maintenance-free New Generation Vinyl inside and out. It never requires caulking or painting or other maintenance. Optional Advanced Easy Clean® Glass needs cleanig half as often and with half the effort as ordinary window glass.