Aero-slide. A double brush seal on both the interlock and the sash keeps draughts out, giving very low air leakage where ordinary sliders often let the weather through.
The system spans openings up to 6m across the range, and a two-panel door reaches 4m wide at 2.4m high.
It takes glazing up to 36mm, including triple glazing, reaching a U-value as low as 1.0 W/m²K.
It is PAS 24 tested, which meets Part Q, so it suits newbuild as well as replacement work.
Every standard finish is available, along with aludec, which looks and feels like real aluminium, and woodec, which looks like real oak and other timber options, all without the price of aluminium.