T450N Lift-and-Slide Window Unit
T450N Lift-and-Slide Window Unit
T450N Lift-and-Slide Window Unit
The T450N Lift-and-Slide brings the precision engineering of the thermally-broken T450N system to large-format horizontal sliding applications. A precision multi-point lifting mechanism raises the sash off its compression seals for effortless, near-weightless operation — then drops it back down onto the seals for an airtight, weather-tight closure that performs like a fixed unit. Panels up to 400 lbs glide with a single turn of the handle.
The system features the T450N's signature 5/8" sightline, a dual-glazed Low-E IGU with argon fill delivering a NFRC U-factor of 0.24 and SHGC options down to 0.20, and a polyamide thermal break strut in both sash and frame. Stainless steel lift-and-slide hardware is fully concealed within the aluminum extrusion cavity — no exposed track, no visible mechanism, just a clean profile and a sash that moves like it weighs nothing.
In a Portland hillside residence or a Marin County modern farmhouse, the T450N Lift-and-Slide transforms a wall into a threshold — and a threshold into a view.
Studio View — Sash Partially Open, Lift Rail and Compression Seal Revealed
The T450N Lift-and-Slide with the sash in the partially open position. The concealed stainless lift rail is visible in the lower track, and the cross-section callout at the sill reveals the compression weather seal gasket in the lifted position — the engineering that makes 400-lb panels feel effortless.
Installed Performance — Portland Modernist Hillside Residence, Autumn
The T450N Lift-and-Slide gliding open to a cantilevered deck overlooking a Douglas fir forest in peak autumn foliage. A couple reads in Eames chairs as amber and gold light filters through the trees — the sash disappears into the wall pocket, and the forest becomes the room.
Multi-Point Lifting Cam Detail — 3mm Lift Position Before Lateral Travel
The multi-point lifting cam mechanism at the handle junction, showing the sash elevated precisely 3mm off the compression weather seal in the lift position — the moment before lateral travel begins. The stainless steel cam is concealed within the aluminum extrusion cavity, maintaining the clean 5/8" sightline profile.
Specifications
| Parameter | Value |
|---|---|
| System | T450N Thermally-Broken Aluminum Lift-and-Slide |
| Operation | Multi-point lift-and-slide; sash lifts 3mm off compression seals before lateral travel |
| Sightline | 5/8" (15.9 mm) — matches T450N window-wall grid profile |
| Max Sash Weight | 400 lbs (181 kg) |
| Glazing Configuration | Dual-glazed Low-E IGU with argon fill |
| U-Factor (NFRC) | 0.24 BTU/hr·ft²·°F (NFRC 100 certified) |
| SHGC | Options from 0.20 to 0.55 (project-specified) |
| Hardware Finish | Stainless steel lift-and-slide hardware, concealed within extrusion cavity |
Extrusion Alloy: 6063-T5 aluminum | Thermal Break: Polyamide struts in sash and frame | Frame Finish: Class 1 anodize or AAMA 2605 PVDF powder coat — custom RAL available