Marvin’s High-Density Fiberglass material and proprietary frame design provide unparalleled thermal performance and durability.
The Integrated Mull Channel, a structural cavity within the frame, allows you to add up to 1⁄2” of mull reinforcement without compromising sightlines. Frame recesses accept a drywall return, allowing for an easier wall integration and consistent frame reveal.
A. Proprietary frame design helps keep interior temperatures comfortable
B. The frame’s integrated mull channel preserves sightlines and supports structural performance
C. Built-in drywall return for easy wall integration