From: Andersen Windows
Part of its broad portfolio of replacement products, the Andersen 100 Series insert windows can be installed from the home’s exterior, making for easier installation and less disruption to homeowners. The window series’ 3 ¼-in. frame can be retrofit into existing window openings and is available in custom sizing for a weather-tight fit. Engineered with the company’s Fibrex composite material, the windows feature a scratch-resistant, thermally bonded finish; clean corners for a refined look that won’t rot, flake, blister or chip; and color-matched installation accessories.