Arched Casement Steel Windows | Energy Efficiency Meets Endless Possibilities

Arched Casement Steel Windows | Energy Efficiency Meets Endless Possibilities

Ever wondered how you can blend architectural beauty with unmatched strength and energy efficiency?

Arched casement steel windows might be the answer you’ve been looking for. These windows not only enhance the aesthetic appeal of your space but also provide durability and thermal performance that’s hard to beat.

The Allure of Arched Casement Steel Windows

Arched casement steel windows are a blend of elegance and robustness. Their design, featuring clean lines and slender profiles, makes them a favorite among architects and homeowners alike. Here are some compelling reasons why these windows stand out:

RTS-430 arched casement steel windows by Optimum Window

Unparalleled Strength and Durability

Steel is renowned for its strength. Optimum Window’s RTS-430 Steel Series exemplifies this with its thermally broken, hot-rolled steel construction. This ensures not only durability but also enhances the structural integrity of your building.

  • Technical Specifications:
    • Thermal Break: Enhances insulation, making them perfect for energy-efficient buildings.
    • Fully Welded Cold-Rolled Frame: Ensures long-lasting durability.
    • Dual Weather-Stripping: Provides superior protection against the elements.
    • Glazing Infill: Accommodates thicknesses from 1″ to 1 5/8″, ensuring versatility in design​​​​.
Frame ConstructionMitered, Welded
CertificationNFRC Rated
Glazing Thickness1” up to 1 5/8”
FinishZinc Rich Epoxy Primer, Polyester Powder Coated
Warranty10 years on Powder Coated Finish

Energy Efficiency

One of the standout features of the RTS-430 series is its energy efficiency. The thermal break technology used in these windows minimizes heat transfer, helping maintain indoor temperatures and reducing energy costs.

Performance Metrics:

  • Air Filtration: 0.03 cfm/ft² for casement, 0.01 cfm/ft² for fixed windows.
  • Water Penetration Resistance: Can withstand pressures up to 6.0 psf.
  • Design Pressure: Rated at 70.0 psf for casements and 80.0 psf for fixed windows​​​​.
Performance MetricValue (Casement)Value (Fixed)
Air Filtration (cfm/ft²)0.030.01
Water Penetration Resistance (psf)6.012.0
Design Pressure (psf)70.080.0

Versatile Design

The arched design adds a touch of elegance and can be customized to fit various architectural steel window styles, from modern to traditional. The RTS-430 series offers multiple configurations, including fixed, casement, and French casement windows, catering to diverse aesthetic and functional needs​​.

Real-World Applications

Optimum Window’s RTS-430 series has been utilized in various prestigious projects, demonstrating its versatility and performance. Whether it’s a residential renovation or a commercial build, these windows deliver both form and function.

Installation and Maintenance

Installing arched casement steel windows might seem daunting, but with an expert team, the process is seamless. Each unit is custom-made to order, ensuring a perfect fit for your project. Additionally, the low maintenance requirements make these windows a practical choice for any building.

Installation Tips:

  1. Ensure proper measurements for a custom fit.
  2. Utilize professional installers to maintain the integrity of the thermal break.
  3. Regularly check weather-stripping and seals to ensure optimal performance.


Incorporating arched casement steel windows into your design is not just about aesthetics; it’s about investing in quality, durability, and energy efficiency. Optimum Window’s RTS-430 series stands as a testament to what modern window design can achieve, offering endless possibilities for those seeking to combine beauty with performance.