Choosing the right outward-opening window comes down to three things: how well it seals against wind and rain, how smoothly it operates year after year, and how clean it looks from both sides of the glass. The ALPES C113 outward-open window is built to answer all three. Designed around a 113 mm frame and a 57 mm glass sash, it pairs a full thermal-break structure with precision hardware, making it a dependable choice for villas, apartments, and commercial spaces that need performance without a bulky frame.
The C113 is one of the lightest outward-opening systems in the ALPES range, but it does not trade strength for slimness. The key numbers:
| Frame width | 113 mm |
| Profile grade | 6060-T66 aluminum |
| Profile thickness | 1.8–2.0 mm |
| Glass sash thickness | 57 mm |
| Mullion width | 75 mm / 21 mm |
| Insulation strip | PA66GF25 thermal break |
| Opening method | Outward opening |
| Screen mesh | Black high-definition anti-PM2.5 mesh |
The frame is the backbone of any window, and the C113 starts with a strong one. Its 6060-T66 aluminum profiles carry an 8 mm wall thickness — noticeably heavier than many standard outward-opening systems — which adds structural stiffness and resists deformation even on larger openings. The corners are joined with integrated glued brackets using a full glue-injection process, so the frame behaves as one continuous piece rather than several pieces bolted together. That single-piece feel translates into less flex over time and fewer places for a draft or a trickle of water to find its way in.
Between the inner and outer aluminum shells sits a PA66GF25 thermal break strip inside a multi-chamber profile. The purpose is straightforward: prevent cold from travelling through the metal frame from the outside to the inside in winter, and keep the heat out in summer. The C113 goes a step further by keeping the glass centerline, the thermal break strip, and the equal-pressure sealing strip on the same axis. When all three line up, the window forms a single isothermal plane, which noticeably improves insulation and reduces the chance of condensation forming on the frame.
Outward-opening windows are only as good as the seal that closes them. The C113 uses a triple-sealing defense around the opening: one line of sealing keeps wind out, a second blocks driving rain, and the third separates indoor from outdoor air to support sound insulation. Because the sealing is distributed across three points, the window stays watertight on exposed elevations and in coastal or high-wind locations where a single gasket would struggle. The result is quieter rooms and less dust finding its way past the frame.
Daily operation is where quality windows either last or wear out. The C113 is fitted with CMECH hardware, a German Red Dot Design Award winner that has been tested through 30,000 opening and closing cycles. The handle and locks keep a firm, even grip on the sash every time you close it, so the seal stays consistent for years rather than loosening after a season of use. For buyers who put a premium on security fasteners, this is a meaningfully better proposition than generic hardware found on lower-tier casement windows.
Because it seals well and opens outward without eating into floor space, the C113 suits a wide spread of settings. It is a natural fit for living rooms and bedrooms where a clean, uninterrupted interior line matters, for kitchens where a window needs to swing wide while staying easy to clean, and for balconies and al fresco-facing rooms where wind and rain are more of a factor. The slim 21 mm mullion also keeps the sightline open, so architects can group several units into one large glazed area without a heavy grid of framing.
A window is also part of a building's face. The C113 comes in the standard ALPES palette — Ice Cream White, Aurora Gray, Starry Sky Gray, and Brown Coffee — and custom color matching is available for projects with a specific finish in mind. On the glass side, multiple insulated glass configurations and tint options let you tune the window for solar gain, privacy, or acoustic performance. Code-specialists, architects, and contractors can request a fabrication drawing to confirm exact dimensions before production.
ALPES is a China-based aluminum system window and door manufacturer running a 100,000 m² production facility across two centers in Foshan and Zhaoqing. The same manufacturing floor that builds the C113 also produces the wider casement, sliding, tilt-and-turn, and sliding-door range, so a project can source its entire glazing package from a single partner. As a casement window manufacturer exporting to multiple countries, ALPES builds to international building codes and offers competitive direct-from-factory pricing on custom orders.
If the C113 looks right for your project, the next step is easy. ALPES supports buyers at every level — from private homeowners ordering a single unit to distributors and contractors ordering in volume — with custom casement window solutions, technical drawings, and installation guidance. Reach out directly to request a detailed specification sheet, a sample, or a quotation, and the ALPES team will size the window around your actual opening.
