A casement sash swings on hinges; a sliding sash moves along a track. That difference changes how you use the space around the window, which parts of the opening can ventilate and how you reach the glass for cleaning.
For a bedroom facing the street
Begin with the noise requirement and the safe opening arrangement. Ask to see the closed seals and locks on the proposed assembly. A casement configuration may be useful where compression sealing is a priority, but the final acoustic result depends on the complete specification. Do not select by the word “soundproof” without supporting evidence.
For a narrow balcony or passage
A sliding window does not swing into the circulation space. Check the handle position, mesh operation and how far the sashes travel. The full width of a sliding frame is not necessarily the usable ventilation opening; ask for a drawing of the open position.
For a kitchen counter
Try the reach to the handle from the finished counter depth. A sash that looks convenient on paper may be difficult to close when a sink or tap is in front of it. Include the grill and mesh in the drawing, and consider cleaning access before finalising the arrangement.
What Astrapia’s profile drawings can tell you
The technical catalogue lists sliding frame examples including AST11-WH at 60 × 47 mm, AST13-WH at 88 × 47 mm and AST12-WH at 108 × 47 mm. It also includes a separate 52 / 80 / 92 mm sliding frame family. These are profile cross-sections, not maximum finished window sizes. Ask which family is specified in your quote.
Casement reference profiles include AST01-WHG and the AST05-WHG window sash. An opening drawing, glass specification and hardware selection are still needed before production. Read the labelled catalogue drawings alongside your quotation.
Use this showroom checklist
- Open and close the sample with one hand.
- Check the lock and the effort needed to operate it.
- Ask how the mosquito screen moves.
- Confirm the safe access needed to clean the outer glass.
- Ask where water drains and how the track is maintained.
- Confirm any sash projection, grill or curtain conflicts.
It is normal to use different systems in different rooms. A fixed picture pane with an opening section may also meet a brief better than making every pane movable. Compare casement, sliding and fixed windows, then share a room-by-room requirement.