Revisions log for question
Can anyone tell me if there is a general tolerance for windows?

Specifically, I am interested in perpendicularity. I have a plastic lift and slide unit where the vertical frame is not at right angles. When the sash is open, this is clearly visible. At the bottom the glass disappears behind the fixed element, at the top I have a view of almost 2 cm.

Is this a defect? Or should I put up with it?

• window
• window tolerance