Such shower doors open into to a shower and are generally used when space is very limited. Sizes start from 760mm and do not normally exceed 900mm in width. Again, as the name indicates the door will fold in the middle as it is opened. This means that the glass is generally framed so more aluminum profile is used and the glass thickness is often reduced by 4mm glass. Cedar Showers have an infold option where the whole door folds into the side of the enclosure.