The Zen MTS50 Thermally Broken Steel Door system is our premium solution for projects where thermal performance, structural strength, and refined steel aesthetics are equally important. Available in hinge, bifold, and lift & slide stacking door configurations, MTS50 has been developed for high-end residential and commercial applications requiring superior insulation without compromising architectural impact.
Manufactured from solid steel and incorporating a true thermal break, the MTS50 profile is designed to minimise heat transfer and improve overall building envelope performance. This makes it our best thermal steel door profile, ideal for projects where energy efficiency, internal comfort, and compliance are a key consideration.
Despite its robust construction, MTS50 maintains a clean and elegant architectural appearance, allowing large openings to be framed with strength and precision. It is particularly well suited to full-height glazed doors, expansive rear elevations, and integrated indoor-outdoor living zones where performance and visual consistency must work together.
The MTS50 system is engineered for those who want the timeless presence of steel with the benefits of advanced thermal technology. Strong, durable, and performance-driven, it offers a sophisticated solution for architects, designers, and homeowners seeking thermally broken steel doors without sacrificing the beauty and character of true steel construction.



