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- Wood Species. Classic Series windows and doors are constructed of Pine (72) as standard, for a stable product that will accept many beautiful finishes.
- Construction. From the selection of wood to delivery of the final product, Kolbe meets strict standards for quality construction. For instance, windows are sealed on both sides of the glass. Interior removable wood grilles have a full perimeter frame for stability. Entrance doors are built with laminated veneered lumber on the locking stiles for strength and security.
- Glass. Classic Series products have H°K dual-insulating glass units with LoE²-270 coating, argon gas, and Thermo-Edge spacers on most units as standard. This helps them to meet or exceed ENERGY STAR® guidelines for energy efficiency in all climate zones.
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