Fixed window with tilt-in top light in Rehau Geneo

GENEO is Rehau's other uPVC window system, with a core of glass-fibre reinforced plastic — Rehau calls it RAU-FIPRO — instead of the usual steel reinforcing sections in the chambers. That makes the profile just as stiff at 86 mm frame depth, and with Uf 0.86 W/m²K (version with thermal modules) it insulates better than any other uPVC profile we offer. The profile has 6 chambers, takes glass up to 53 mm and has been tested up to burglar resistance class RC3. The face of frame and sash together runs from 99 to 179 mm, and 110 to 214 mm on a French casement (figures given by Janwillem on 14 September 2026 from the Rehau data sheet).

Rehau's uPVC window with a glass-fibre core: 86 mm and Uf 0.86 W/m²K.

A tilt-in sash at the top, a fixed pane below carrying most of the glass: this window combines ventilation up high with a large, still area of glass.

This window splits its height in two: a small bottom-hung sash at the top that tilts inward for ventilation, and a larger fixed pane below that doesn't move. It is the same split as the fixed window with top light, but with an opening in the upper pane instead of fixed glass. That suits a bathroom, WC or stairwell where you want to air the room now and then without a sash swinging open at eye level.

The standard size is 1,100 × 1,800 mm, with the tilt-in sash taking a quarter of the height and the fixed pane the rest. If in that same spot you do want full ventilation and the option of cleaning the glass from inside, the tilt and turn window with tilt-in top light — the same window with a tilt and turn sash instead of the fixed lower pane — is the broader choice.

All about the Rehau Geneo profile All about the fixed window with tilt-in top light layout