



MB-Slimline
Ultra-slim aluminum windows for maximum daylight
The MB-Slimline is a premium aluminum window system offering exceptionally narrow visible sightlines, designed to maximize natural light and provide a sleek, minimalist aesthetic. It is perfect for capturing expansive Pacific Northwest views while delivering the robust thermal and acoustic performance required for modern high-end builds.
MB-Slimline also comes in a hidden sash variation, making the operable window completely invisible from the exterior.
Performance
- U-Factor: from 0.15 Btu/hft²F
- SHGC: 0.17 – 0.42
- Noise Reduction: Up to 42 dB
Characteristics
- Hidden Sash Option: Operable vents are concealed behind the outer frame.
- Exceptionally narrow visible frame profiles.
- Frame depth: 2-11/16″ (68.5 mm).
- Glazing: Up to 81 mm (Triple or quadruple pane ready).
- High-performance polyamide thermal breaks.
- Wide range of powder-coated colors and anodized finishes.
- Available with nailing fin.
Benefits
- Maximum daylight: High glass-to-frame ratio allows for expansive, unobstructed views.
- Minimalist design: Ideal for contemporary architecture or replicating the classic look of steel windows.
- Structural durability: Heavy-duty weather resistance engineered for coastal wind and rain.





