An aluminium frame swing door is a hinged door whose frame and leaf are built from extruded aluminium profiles. It opens by rotating on hinges fixed to one jamb, rather than sliding along a track or concertina-ing back on itself. That one mechanical difference — rotation instead of translation — explains nearly every strength and nearly every limitation the door type has, and it is the reason swing doors still outsell every other configuration for building entrances despite being the oldest idea in the catalogue.
"Swing door" is a working description rather than a regulated one. In practice it refers to a door assembly with three fixed characteristics: the load-bearing frame and the opening leaf are both aluminium extrusions, the hinge axis sits at the vertical edge (the jamb) rather than at the head or floor, and the leaf carries either a glazed infill, a solid panel, or a combination of both. You will see the same product sold as a hinged door, a casement door, or a side-hung door depending on the market.
Within that definition there is a wide range of configurations. A single leaf on two or three hinges is the simplest. A pair of leaves meeting at the centre gives you a double door, often called a French door when both leaves are glazed. The leaf can swing inward or outward, and it can be paired with fixed sidelites or a transom above to fill a wider structural opening than a single leaf could comfortably span.
Two swing doors can look identical in a photograph and behave completely differently after five winters. The difference is never the styling. It is these five parts.
| Component | What it does | What to look for |
|---|---|---|
| Profile and wall thickness | Carries the leaf weight and resists racking at the corners | A named alloy and temper such as 6060-T66, with a stated measured wall thickness. ALPES machines its systems at 1.8–2.0 mm and reinforces main load-bearing sections to 2.2–3.0 mm. |
| Thermal break | Stops the frame from acting as a metal fin between inside and outside | PA66GF25 polyamide strip, multi-chamber, with the strip width stated in millimetres. ALPES runs 34–44 mm multi-chamber strips on its higher-performance systems. |
| Hinges | Hold the leaf in alignment for the life of the door | 304 stainless steel high-load hinges, seated in a hardware groove rather than surface-fixed, with a rating matched to the finished leaf weight. |
| Sealing | Blocks air, water and dust around the full perimeter | Three continuous sealing lines with corners either welded or injection-moulded, not mitred and butted. |
| Locking | Pulls the leaf onto the seals and resists prying | A multi-point mechanism driving lock points at several positions. ROTO transmission boxes with anti-pry lock points and CMECH handle gear tested to 30,000 cycles are the reference points used across the ALPES range. |
Thermal performance is traded as a K-value or U-value in W/m²K, and lower is better. Aluminium conducts heat roughly a thousand times faster than the polyamide used in a thermal break, so the strip is doing almost all of the insulating work at frame level. Glazing does the rest.
Here is where buyers get misled. A K-value belongs to one tested configuration, not to a company. On the ALPES side, the quoted figures are attached to specific systems: 1.3 on the AW90 passive window, 1.6 on the C120 outward-opening window, 1.7 on the C116. Those are useful as evidence that the profile platform and glazing are capable of that level. They are not a promise that any door you order will land on the same number. When you ask a supplier for a K-value, ask which model it was measured on and ask for the test report that goes with it. A round number with no test behind it is a marketing number.
Outward-opening leaves are the default for exterior doors in most climates, and for a mechanical reason rather than a stylistic one. Wind and driving rain push the leaf against its seals instead of trying to peel it off them, and the leaf does not consume floor area inside the room.
It is worth being direct about this: the swing door is not the best answer for every opening. It wins on sealing and loses on span, and no amount of engineering reverses that trade.
| Factor | Swing | Sliding | Folding |
|---|---|---|---|
| Sealing principle | Compression gasket all round | Brush or fin pile against a track | Gasketed, but across many moving joints |
| Air and water tightness | Best of the three | Moderate, though side-pressure and lift-slide systems close much of the gap | Moderate |
| Clearance required | A quarter-circle of floor equal to the leaf width | None | A stacking zone at one or both sides |
| Practical span | Single or double leaf | Widest of the three, with single panels over two metres achievable | Wide, and opens the elevation almost completely |
| Best placed at | Front entrances, balconies, room-to-garden doors | Patios, wide garden elevations, anywhere furniture sits close behind | Openings between a room and a terrace that you want to remove entirely |
Being blunt about the failure cases saves more money than any sales pitch. Do not specify a swing leaf where the sweep crosses a stair landing or a corridor that people need to walk down. Do not push a single leaf wider than the hardware is rated for; the leaf gets heavy, the hinges take the load in shear, and the door starts to ｄｒｏｐ at the latch within a season. Avoid outswing leaves on a windward corner with no porch or reveal to shelter them, because a gust catches the open leaf like a sail and puts the hinges and the closer into tension they were not sized for. And if the door needs to swing both ways, that is a different product with double-acting floor springs rather than a jamb-hinged swing door.
Send these to any supplier you are comparing, including us. The value is in the third column: a vague answer to a specific question tells you what you need to know.
| Ask | A usable answer | Red flag |
|---|---|---|
| Alloy, temper and wall thickness | 6060-T66 with a measured thickness in millimetres | "High-grade aluminium alloy" with no number |
| Thermal break material and width | PA66GF25, multi-chamber, width stated | "Thermal barrier" with no material named |
| K or U value | A figure, the model it was measured on, and a test report | A single number quoted with no test behind it |
| Hardware brand and cycle testing | ROTO, Winkhaus, CMECH or Wehag, with cycles stated | "German hardware" with no brand |
| Hinge material and rating | 304 stainless, load rating matched to finished leaf weight | "Heavy duty" as the whole answer |
| Sealing and corner construction | Three lines, corners welded or injection-moulded | "Fully sealed" |
| Glazing build-up | Pane count, Low-E coating, gas fill, overall thickness in mm | "Double glazed" |
| Corrosion testing | Salt spray hours stated against a named standard. The AW90 platform is tested at 240 hours. | No test data at all |
| Threshold and drainage | A described threshold type and a defined water path to the outside | Threshold not mentioned |
| Documentation | Section drawings, installation detail, hardware schedule | Only a rendered brochure image |
Most swing door complaints trace back to installation rather than manufacture. The frame has to be set plumb, level and square before it is fixed, or the leaf will never sit evenly on its seals no matter how good the hardware is. Shim at the fixing points, not mid-span, and tie the perimeter back to the building's air and water barrier rather than relying on a cosmetic bead of caulk.
In most catalogues, yes. Both terms describe a side-hung leaf on jamb hinges. "Casement door" tends to appear in British and Commonwealth usage and "swing door" in North American and Asian usage. Check the opening direction and hinge side on the drawing rather than relying on the label.
If the door separates a conditioned space from the outside, yes. Without one, the frame is a continuous metal path and condensation will form on the inner face in cold weather. An unbroken frame can still be the right choice for an interior door or a plant room, where insulation is not the point.
Large enough for almost any residential opening, and the practical limit is set by hinge and frame load capacity rather than by the profile supplier. This is a genuine engineering question, so ask for the rated maximum leaf size and weight for the specific system and stick inside it. Where a single leaf would exceed the rating, move to a pair or change the door type.
Treat any number of years quoted without test data as decoration. The two figures that actually predict service life are the hardware cycle rating and the corrosion test result for the finish. Ask for both, and ask what the finish warranty document says rather than what the brochure implies.
ALPES manufactures aluminium window and door systems from a 100,000 m² production base across two centres in Foshan and Zhaoqing, Guangdong, supplying villa and commercial projects in the Middle East and Australia. The aluminium glass swing door configurations are built on the same profile platform as the rest of the range: 6060-T66 alloy, PA66GF25 multi-chamber thermal breaks, and hardware from ROTO, Winkhaus, CMECH and Wehag rather than unbranded alternatives.
If you are working to a schedule or a set of architect's drawings, send the opening dimensions, the required opening direction and the performance targets you need to hit. A custom swing door is specified per opening, so drawings beat general descriptions every time. Standard colours include Ice Cream White, Aurora Gray, Starry Sky Gray and Brown Coffee, with matching available. Reach the team through the ALPES contact page to start a drawing review.
