Infinity by Marvin offers the following fiberglass window styles for homes.
- Awning windows are hinged at the top and open outward diagonally. This design offers maximum airflow and allows rain to slide off when opened during storms.
- Bay windows: These windows have three panels set at 30- to 45-degree angles that protrude from your home. They offer architectural interest and create additional interior space for seating or storage.
- Bow windows: Similar to bay windows, these form a 3D shape but have a more curved angle.
- Casement windows: These windows attach by one or more hinges on the side and open to the left or right.
- Double-hung windows: These windows have a movable upper and lower sash for maximum ventilation and easy cleaning.
- Round top windows: These fixed windows come in a half-moon shape and add decorative touches to any room.
- Single-hung windows: This style has a movable lower sash and fixed upper sash for added security, especially in ground-floor rooms.
- Single-hung round-top windows add a quarter or half-moon arch to typical sing-hung windows.
- Slider windows: Also known as glider windows, these move along a track to the left or the right and work best in rooms with limited space.
- Unique shape windows: These decorative fixed windows come in various shapes, including pentagons, trapezoids, and octagons.
Infinity also offers in-swing French, sliding French, patio, and bi-fold doors.
A Better Fit for Colorado Homes — Why Fiberglass Outperforms Vinyl
Infinity® by Marvin® fiberglass windows and doors are built with patented Ultrex® fiberglass, engineered to handle Colorado’s extreme temperature swings without warping, sagging, or cracking. By contrast, many vinyl windows can fail in less than a decade. While vinyl may look cheaper upfront, homeowners often face premature repairs or full replacements. Choosing fiberglass means investing once—and enjoying decades of comfort, efficiency, and peace of mind.
Energy Savings with Infinity® by Marvin® Fiberglass Windows
Independent studies show that energy-efficient windows can reduce heating and cooling costs by 11% to 37%.* Infinity® by Marvin® fiberglass windows combine advanced glass packages with strong, insulated Ultrex® frames to keep Denver homes comfortable year-round. As one of the nation’s oldest fiberglass window dealers, Gravina’s Window Center of Littleton® has seen firsthand how fiberglass consistently outperforms vinyl and wood in Colorado’s climate.
Trusted Colorado Dealer for Infinity® by Marvin® Fiberglass Windows
With more than 50 years of experience, Gravina’s Window Center of Littleton® is Colorado’s trusted source for Infinity® by Marvin® fiberglass replacement windows and doors. As a family-owned business, we take pride in delivering attentive service, professional installation, and products that stand the test of time. Every window features Ultrex® fiberglass frames for durability, low maintenance, and lasting performance—all backed by an industry-leading limited lifetime warranty.
Schedule your free consultation today or visit our Littleton showroom to see Infinity® by Marvin® fiberglass windows up close. Discover why Colorado homeowners continue to trust us for expert window replacement since 1973.
*Source: Efficient Windows Collaborative
**For J.D. Power 2019 award information, visit jdpower.com/awards
Infinity® by Marvin® Fiberglass Windows Catalog
Options and sizing for Infinity windows and doors.
(36 pages)
