Infinity Windows

Infinity Windows

Built for LIfe®

  • Incorporates the details of traditional wood windows without the maintenance
  • Low maintenance Ultrex® Fiberglass exterior and interior
  • Infinity offers two window replacement methods - Insert or Full Frame. 
  • Both methods are designed for maximum efficiency and minimal disruption to your home.

Infinity is a line of pultruded fiberglass replacement windows and patio doors designed by the experts at Marvin Windows and Doors, a company with a rich history of craftsmanship, knowledge and dedication dating back to 1912.

These replacement windows and doors are made in custom sizes with options and features that meet your expectations. Infinity's thoughtful designs, appearance, and options allow you to match the style of your home, and stay within your budget. Infinity products are made from Ultrex fiberglass, a material that outperforms roll-form aluminum, vinyl, and vinyl/wood composites in virtually every measurable category. While other replacement windows might bow, break or chalk over time, Infinity windows stand up to the elements, while maintaining their beauty.

See the products that have set the standard in replacement windows at

Product Line

Double Hung
Casement & Awning
Round Top
Polygon & Picture


Infinity Ultrex Fiberglass Double Hung
Infinity Ultrex Fiberglass Casement
Infinity Ultrex Fiberglass Round Top
Infinity Ultrex Fiberglass Polygon