Choosing an inward-opening window starts with the room around it. The ALPES AW90 combines tilt and turn operation with an inward-opening sash, so a useful project brief must address interior clearance, frame dimensions, glazing and hardware together. For homeowners, architects and project buyers, these details make a quotation easier to evaluate and help identify configuration questions before ordering.
What should you check before specifying AW90? Confirm that the room can accommodate the inward-opening sash, match the published frame and sash dimensions to project drawings, and request the exact glass and hardware specification. Evaluate performance using documentation for the proposed configuration; a model name or an isolated thermal number is not enough to establish suitability.
How does tilt and turn operation affect room planning?
ALPES describes its aluminum tilt and turn windows as providing an inward-turning opening and a tilt position for ventilation. The inward-opening movement is the key space-planning consideration: the sash needs room to move inside, while the handle and opening must remain accessible.
Mark nearby curtains, blinds, furniture and deep window reveals on the room drawing. A window that fits the wall opening may still conflict with a desk, tap or curtain track. Ask for an opening diagram showing the proposed hinge side, handle position and sash movement before finalizing the layout.
- For ventilation: identify which rooms need the tilt function and how occupants will reach the handle.
- For the turn position: check the space available for the inward swing and access around the open sash.
- For screens: ask how the selected screen arrangement works with both opening modes and cleaning access.
Which AW90 specifications are published?
The AW90 aluminum tilt and turn window product page provides the following specification fields. Use them as a starting point for a technical discussion, then confirm the section drawings and configuration included in your quotation.
| Published field | Published value | What to confirm |
|---|---|---|
| Profile Thickness | 1.8 mm | The profile sections proposed for your opening sizes. |
| Profile Grade | 6060-T66 | The material specification recorded in the quotation. |
| Frame Wall Width | 90 mm | The frame section and its relationship to the wall detail. |
| Glass Sash Thickness | 90 mm | The sash section; obtain the glass build-up separately. |
| Insulation Strip | Multi-Chamber Insulation Strip + Insulation Sponge | The assembly and performance documentation for the quoted window. |
| Opening Method | Tilt and Turn / Inward Opening | Hinge side, handle position and interior clearance. |
| Standard Screen Mesh | 40# Black S/S Mesh | The screen arrangement supplied with each opening. |
Source: ALPES AW90 product information reviewed on September 21, 2026. Field names follow the product page. Published dimensions do not establish maximum sash sizes or a complete installation specification.
Separate the sash dimension from the glass specification
The 90 mm value labeled “Glass Sash Thickness” describes a sash dimension. It should not be read as 90 mm of glass or as confirmation of a particular glazing arrangement. Request a separate glass specification that identifies the pane and cavity arrangement, total glazing-unit thickness and any proposed coatings or treatments.
Explain your priorities in practical terms: afternoon sunlight, privacy, views, indoor comfort or nearby traffic noise. Ask ALPES which glazing options it can offer for the proposed AW90 configuration and what supporting performance information is available. Avoid comparing quotations that use different glass specifications as though they describe the same window.
Read thermal figures with their supporting evidence
The AW90 page lists “Thermal K-Value: 1.3.” The specification field does not state the unit, test method, specimen dimensions or whether the result applies to a complete window or a component. Request those details before using the number in a project comparison.
The product name also includes “Passive Window/Inward-Open.” That wording alone does not establish Passive House certification. If a project requires documented performance or certification, ask for the relevant evidence and confirm that it covers the proposed model, size and glazing configuration.
Confirm hardware, screens and finishes as one package
The AW90 page describes Winkhaus hardware and an optional C-Slot ROTO system. Ask the quotation to identify the actual hardware package, handle finish and any agreed operating restrictions. A brand name alone does not describe every component included in an order.
For the appearance, request a finish sample or agreed color reference. Check how the frame, handle and screen will look together, and record the selected screen specification. These choices should appear alongside the opening layout and glass specification so that the final order describes a complete configuration.
What should an AW90 enquiry include?
- Project context: location, building type, room use and relevant exposure conditions.
- Opening schedule: a unique reference, width, height and quantity for each opening. State whether dimensions are wall openings or proposed frame sizes.
- Layout drawings: fixed and opening sections, intended hinge sides, handle access and nearby interior obstacles.
- Configuration preferences: glass requirements, frame finish, screens and hardware preferences.
- Evidence needed: drawings and performance documents required for the proposed configuration.
- Supply expectations: delivery destination, requested schedule and the services you want included in the quotation.
Frequently asked questions
Does AW90 open outward?
The published AW90 opening method is tilt and turn with inward opening. Plan the interior sash clearance around that operation and confirm the final layout on the project drawing.
Does the 90 mm sash dimension identify the glass package?
No. The sash dimension and glazing specification are different information. Ask for the exact pane and cavity arrangement offered for your order.
Can AW90 be compared using the listed K-value alone?
No. A meaningful comparison needs the unit, test method, assembly scope and tested configuration. Request those details for each proposed window before drawing a thermal-performance conclusion.
What is the most useful first step before requesting a price?
Prepare an opening schedule and a room layout showing inward-swing clearance. Add your glass, finish and hardware priorities so the quotation can address the actual project.
Plan your AW90 configuration with ALPES. For a window and door project quote, send your project location, opening schedule, drawings and preferred configuration. Ask the team to identify the proposed glass, hardware, finish and supporting documents in its response.
