T450N Dual Casement Window Unit
T450N Dual Casement Window Unit
T450N Dual Casement Window Unit
The T450N Dual Casement is a thermally-broken two-sash outswing casement window fabricated from 6063-T5 aluminum with polyamide thermal break struts and the same 5/8" sightline profile as the T450N window-wall system — designed to integrate seamlessly into T450N grid assemblies or stand alone in residential and light-commercial applications where ventilation, precision hardware, and architectural refinement are non-negotiable.
The unit ships with a factory-installed multi-point locking espagnolette and concealed European-style hinges rated at 220 lbs per leaf, providing the security and smooth operation that luxury projects demand. A dual-glazed Low-E IGU with argon fill delivers a NFRC U-factor of 0.24, and the unit complies with AAMA 450, ENERGY STAR, and applicable IBC ventilation requirements. From a Manhattan loft to a Pacific Heights townhouse, the T450N Dual Casement brings the precision of curtain-wall engineering to the residential window.
Studio View — Both Sashes Open at 90°
The T450N Dual Casement with both sashes open at 90°, displaying the 5/8" center mullion, concealed European hinges at the sash-to-frame junction, and the multi-point espagnolette handle in the locked position. The thermally-broken aluminum frame is visible in cross-section at the sill.
Installed Performance — Manhattan Loft, Architectural Drafting Table
The T450N Dual Casement open over a drafting table in a Manhattan loft conversion at late afternoon. The New York skyline and rooftop water towers are framed through the glass — the 5/8" sightline disappears, and the city becomes the view. The kind of window that makes a workspace feel like a studio.
Concealed European Hinge Detail — 220 lb Load Rating
The concealed European hinge at the sash-to-frame junction, showing the 220 lb load rating stamp on the hinge body and the precision aluminum mortise pocket. The hinge is fully concealed when the sash is closed, maintaining the clean sightline profile on both interior and exterior faces.
Specifications
| Parameter | Value |
|---|---|
| System | T450N Thermally-Broken Aluminum Dual Casement |
| Operation | Two-sash outswing casement; both sashes independently operable |
| Sightline | 5/8" (15.9 mm) — matches T450N window-wall grid profile |
| Glazing Configuration | Dual-glazed Low-E IGU with argon fill |
| U-Factor (NFRC) | 0.24 BTU/hr·ft²°F (NFRC 100 certified) |
| Hinge Rating (per leaf) | 220 lbs — concealed European-style, factory-installed |
| Locking System | Multi-point espagnolette, factory-installed |
| Compliance Standards | AAMA 450, ENERGY STAR, IBC ventilation requirements |
Extrusion Alloy: 6063-T5 aluminum | Thermal Break: Polyamide struts | Finish: Class 1 anodize or AAMA 2605 PVDF powder coat — custom RAL available | Grid Compatibility: T450N window-wall system