Bottom-hung tilt-in window in Reynaers SlimLine 38

With 33.5 mm of frame and 33 mm of sash in view (Classic; Cubic and Ferro 38.5 mm frame, T-section 48 mm), SlimLine 38 recreates the slim lines of traditional steel windows — the look often called Crittall-style — in aluminium. Frame depth 99 mm with an 86 mm sash for Classic, 76 mm frame for Cubic and Ferro; Uf 1.9 W/m²K; the HI+ version reaches down to 0.74 W/m²K as a whole window (Uw, so including the glass). There are four styles: Classic, Cubic, Ferro and Functional. The profile is Cradle to Cradle certified and, according to the manufacturer, 100% recyclable.

Reynaers' slim steel-look profile: 33.5 mm of frame in view, in aluminium.

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 Reynaers SlimLine 38 profile All about the bottom-hung tilt-in window layout