Simple, clean design. Larger glass area lets in more light. Real wood construction. Quality craftsmanship. Natural wood interiors. Attractive low maintenance Perma-Shield® exteriors. Smooth & effortless operation. Reach-out lock pulls panel tight against frame. Self contained leveling adjusters. Low-E or dual-pane insulating tempered glass for optimum temperature control. High-tech weatherstripping. Wide range of sizes. Variety of grilles & insect screen options. Renowned limited warranty. One of the largest service networks in the indust