The Northview single-hung window is constructed of energy-efficient vinyl that will not warp, peel, or corrode and will provide years of trouble-free operation and performance. The frame and sash are fusion welded for strength and squareness and along with the 5/8-inch thick insulated glass, will aid in energy savings. The sash is balanced with block-n-tackles for easy operation and simply tilts inward for ease of cleaning. It also features a fully weather-stripped interlocking sash with a hook-style lock that adds the comfort of knowing your structure is secure and sealed against the exterior elements.