Commercial Window Systems
Precision Engineered for Performance & Design
At Capitol Aluminum & Glass Corporation, our commercial window systems are meticulously engineered to provide superior performance, energy efficiency, and design flexibility for a wide range of institutional and commercial applications. Crafted with precision in our state-of-the-art facility, each window series is designed to meet the rigorous demands of modern building envelopes while enhancing aesthetics and long-term value.
From maximizing natural light to optimizing thermal performance, our window solutions are tailored to your project's unique needs, ensuring durability, security, and occupant comfort.

Explore Our Window Systems
We offer a diverse portfolio of window systems, each precision-engineered to meet specific project requirements with advanced technology and exceptional craftsmanship. Our Energy-Efficient Solutions are specifically designed for optimal thermal performance, making them ideal for projects prioritizing energy conservation and reduced operating costs.
Capitol 325 ES (Energy Sentry) Window System:
As a 3-1/4" depth system, the 325 ES series is known for its robust thermal capabilities and balanced performance. Utilizing a Pour and Debridge (P&D) thermal break, it provides excellent energy efficiency, making it a reliable choice for a wide array of commercial and institutional buildings seeking to minimize heat transfer and maximize comfort.
- Optimized for thermal performance and significant energy savings.
- Creates comfortable interior environments by minimizing heat transfer.
- Reliable choice for diverse commercial and institutional projects.
Capitol 325 ES-I (Energy Sentry) Window System:
Also a 3-1/4" depth system, the 325 ES-I is an enhanced iteration of the Energy Sentry line. It features an advanced i-strut (polyamide) thermal break for improved insulation and air infiltration resistance, providing an even higher level of thermal performance. It's an ideal solution for projects where superior energy conservation is paramount.
- Superior thermal efficiency with advanced i-strut thermal break for maximum energy savings.
- Minimizes air infiltration, ensuring exceptional indoor comfort and air quality.
- Perfect for projects with critical energy conservation goals.
Capitol 325 SS (Super Sentry) Window System:
This 3-1/4" depth system from the Super Sentry is built for durability and high performance. Similar to the 325 ES but featuring a thicker .125" wall extrusion (compared to the 325 ES's .080" wall), it offers exceptional structural integrity and resistance to the elements. Utilizing a Pour and Debridge (P&D) thermal break, its versatile design allows for a broad spectrum of architectural applications, providing both aesthetic appeal and reliable functionality.
- Enhanced structural integrity with thicker extrusions for long-term durability.
- Robust resistance to harsh environmental elements.
- Versatile design suitable for a broad spectrum of architectural styles.
Capitol 325 SS-FF (Super Sentry Flush) Window System:
An enhanced iteration of the 325 SS, this 3-1/4" depth system also utilizes a Pour and Debridge (P&D) thermal break. The 325 SS-FF variant features flush face sash construction, offering a sleek, modern aesthetic along with robust performance. It provides the same high durability as the 325 SS but with specialized design features to meet unique project specifications, making it suitable for architectural designs prioritizing clean lines.
- Achieves a sleek, contemporary aesthetic with flush face sash construction.
- Maintains robust performance and durability for demanding applications.
- Ideal for architectural designs that prioritize clean lines and sophisticated appearance.
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