Bottom-hung tilt-in window in Aluprof MB-Ferroline

The Aluprof MB-Ferroline is made to look like steel pivot doors and old factory windows: 97 mm of sightline for frame and sash together, in aluminium. At 97 mm it has the slimmest combined frame-and-sash sightline of the Aluprof windows; only the Reynaers CS 77 (89 mm) goes below it in aluminium — for comparison, the Gealan S 9000 in uPVC sits at 119 mm. That slimness costs insulation: Uf 1.50 W/m²K, against 0.57 for the MB-86N. The 110 mm frame depth is there for stiffness, not for insulation.

Steel-look aluminium windows: a 97 mm sightline, the slimmest of the Aluprof windows.

A bottom-hung window has its hinge at the bottom instead of the side, and that makes it the window for the spot you'd rather not reach with a handle.

A bottom-hung window tilts open inward from the top, with the hinge on the sill. That is the exact opposite of a side-hung casement, which is hinged at the side. The practical result: you can fit a bottom-hung window high in a wall — above a basin, in a WC, above a kitchen worktop — and still operate it without a sash swinging into the room at head height. The opening is set to one fixed gap, not a range of positions as with tilting.

The standard size is 1,100 × 800 mm: wider than it is tall, to suit the narrow strips where a bottom-hung window usually goes. Choose one if you're mainly after ventilation in a spot where you rarely or never look out, and not if you also want to clean the glass from inside there — for that you need to be able to reach the window, as with a side-hung casement.

All about the Aluprof MB-Ferroline profile All about the bottom-hung tilt-in window layout