Traditional proportions, replicated SDL profiles, and larger openings with modern Narrow Line performance.
Narrow Line Tier III – Heritage XL was engineered by Synergy Group in 2025 for heritage-driven applications requiring traditional proportions, replicated Simulated Divided Lites (SDL), and larger openings. It brings the Narrow Line Family welded construction approach into projects where visual depth, replication detailing, and historic influence are central to the design intent.
- Heritage and historically influenced projects
- Traditional fenestration proportions
- Custom and replicated SDL layouts
- Larger opening capability
- Seamless welded joinery
- Side-mounted casement availability
Tier III – Heritage XL is designed for heritage, replication, and adaptive reuse projects where traditional aesthetics and modern performance must work together. Featuring narrow profiles, enhanced SDL depth, and the ability to accommodate larger openings, it helps architects and project teams preserve the character of historically influenced buildings while meeting today’s performance expectations. The result is a window system that respects architectural heritage without compromising durability, comfort, or efficiency.
View our Tier II – XL for projects needing increased scale without heritage replication language.
View our Tier IV – All-Aluminum XL for projects requiring all-aluminum construction.
- Developed for heritage and historically influenced projects.
- Supports traditional fenestration proportions at increased opening sizes.
- Supports custom and replicated SDL layouts.
- Designed to replicate heritage profiles and visual depth.
- Seamless welded joinery remains consistent across all configurations.
- Suitable for projects requiring traditional appearance with modern performance.
Use Tier III – Heritage XL where the project requires traditional appearance, replicated SDL detail, larger opening sizes, and modern Narrow Line performance.
- Heritage and historically influenced projects.
- Adaptive reuse projects requiring traditional proportions.
- Custom residential work with divided lite layouts.
- Projects requiring visual depth and profile replication.
- Casements that extend down to finished floor level where side-mounted operation is needed.
Heritage Proportions at Larger Opening Sizes
Tier III – Heritage XL supports traditional fenestration proportions while allowing the Narrow Line family to be applied at increased opening sizes. This makes it suitable for projects where the window must respect a historic visual language without reverting to outdated performance expectations.
Custom and Replicated Simulated Divided Lites
Tier III – Heritage XL supports custom and replicated Simulated Divided Lites (SDL) layouts. SDL profiles can be used to reinforce traditional proportions, add visual depth, and support project-specific replication requirements.
Modern Performance with Traditional Appearance
The system maintains seamless welded joinery, controlled narrow sightlines, and modern glazing capability while allowing the exterior appearance to align with heritage or traditional architectural requirements.
Tier III – Heritage XL is available as a side-mounted casement configuration for casements that extend down to finished floor level. This is useful where a heritage or traditional casement appearance needs to be paired with a more practical operating hardware location.
Technical Summary
|
Tier name |
Narrow Line Tier III – Heritage XL |
|
Engineered |
2025 |
|
Construction |
Welded aluminum frame and sash assemblies |
|
Glazing |
Dual-insulated glazing; triple-insulated glazing; laminated glass |
|
Configurations |
Casement and awning |
|
SDL capability |
Custom and replicated SDL layouts; putty SDL style available |
|
Side-mounted casement |
Available |
|
All-aluminum |
No. Use Tier IV for all-aluminum construction. |
|
Best suited for |
Heritage-driven applications, traditional proportions, replicated SDL layouts, and larger openings |
Contact Synergy Group to review whether Narrow Line Tier III – Heritage XL is the right fit for your heritage, traditional, or replication-driven project.