Verified from the manufacturer’s own documentation · last checked September 19, 2026
| Manufacturer | Infinity by Marvin |
|---|---|
| Series | Ultrex fiberglass windows |
| Frame material | Fiberglass: Marvin's proprietary pultruded Ultrex fiberglass (Infinity says it is 8x stronger than vinyl) with an acrylic exterior finish Infinity describes as 3x thicker than competing finishes. Optional EverWood interior — an engineered wood-grain finish that Infinity says can be stained or painted. Manufactured in Fargo, North Dakota |
| Styles / configurations | Infinity sells a full replacement window collection plus sliding and swinging French patio doors; confirm the current style list with an Infinity design consultant |
| Glass options | Low-E insulating glass packages; confirm the exact package on the quote and the NFRC label |
| U-factor | Not published as a single line-wide range; check the NFRC label on the exact unit quoted |
| SHGC | Not published as a single line-wide range; check the NFRC label on the unit quoted |
| VT | Not publicly specified |
| ENERGY STAR | Certification follows the glass package and climate zone — confirm for the exact unit |
| NFRC certification | Check the NFRC label on the unit quoted |
| Warranty | Infinity states its products carry a Limited Lifetime product warranty, and that Infinity also provides a lifetime service and installation warranty when it installs the windows. Component-level terms, transferability and exclusions were NOT confirmed from a written Infinity warranty document on September 19, 2026 — request the written product and installation warranties with the quote |
| Positioning | Marvin's replacement-only fiberglass brand, sold as a start-to-finish consultation, manufacture and installation service — Marvin's counterpart to Renewal by Andersen. Built around Ultrex fiberglass with optional EverWood interiors |
| Price position | Premium replacement (full-service, installed price) |
| Installation | Replacement only; sold and installed through Infinity's own full-service replacement network (in-home consultation to installation) |
Notes
Fiberglass. Added September 19, 2026 as a new manufacturer brand (Marvin-owned) after checking the catalog: Marvin Essential / Elevate / Vivid also use Ultrex but are dealer-sold Marvin lines, not Infinity. The brand appears as both 'Infinity from Marvin' and 'Infinity by Marvin'; the current site uses 'Infinity by Marvin'. Strength and finish-thickness figures are manufacturer claims. Written warranty not yet obtained — open item. Performance data is style- and glazing-specific — check the NFRC label
Sources
Infinity by Marvin homepage (infinitywindows.com) for Ultrex, acrylic finish, EverWood and Limited Lifetime Warranty statements; infinitywindows.com/why-fiberglass and the Ultrex blog page for material description; Infinity campaign pages (discover.infinitywindows.com) for replacement-only positioning, Fargo manufacturing and the lifetime service and installation warranty statement; Marvin.com footer listing Infinity and Infinity Replacement as Marvin brands