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- Wood Species. Ultra 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. Half-rounds are constructed with doweled joints and turnbuckles at critical stress points for stability. Interior removable wood grilles have a full perimeter frame for stability. Ultra Series frames are screwed at the corners, with silicone to seal corner junctures and screw openings.
- Glass. Ultra 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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