Kolbe’s Forgent® Series Double-Hung Replacement


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A History of Excellence in Kalamazoo, Grand Rapids, Battle Creek and West Michigan

Kolbe Windows & Doors has been committed to superior quality, custom craftsmanship and design excellence for over 70 years. Kolbe’s one-of-a-kind windows and doors are proudly made in the USA and can be found in some of the most impressive homes and businesses across North America. Kolbe leads the industry with innovative products that push the boundaries and defy the limits of function, performance and style.


Kolbe’s Forgent® Series

Designed for strength, performance and ease-of-installation, Forgent Series windows and doors feature innovation and thoughtful design, making them simple, convenient and easy to install. Short lead times for projects requiring windows and doors quickly make the Forgent Series a perfect choice for new construction and replacement projects.

Watch the video to see the strength of Glastra.

Forgent Series windows and doors are comprised of Glastra® – a proprietary hybrid of fiberglass and UV stable polymer, formulated for strength and resilience. An advanced ladder design adds strength, while promoting long-term durability and energy efficiency for comfortable homes. An integral nailing fin and welded sash and frame provide rigidity – keeping units square, and preventing air and water from entering the joint.

BlackBerry offers a variety of financing options, tailored to meet your needs and get your home improvement project going!