The Spectus vertical slider combines perfect proportions, period details and traditional techniques. Both frames and sashes can be mechanically jointed, avoiding the ‘giveaway’ mitred weld of PVC-U. Sash horns are part of the sash, not an afterthought. Georgian 
bars are milled for a superb fit. Deep bottom rails and a choice of sashes give impeccable sightlines. Traditional box-sash dimensions, hardware and glorious period colours – it’s enough to melt the heart of the toughest planning officer.