For external doors opening inwards and outwards, and for internal door frames and linings. For frames with wing lights the window portion is required to comply with BS 644-1. Frames for fire check doors are excluded (BS 459:Part 3). Construction, priming. Cross References:BS 459:Part 1BS 459:Part 2BS 459:Part 3 BS 459:Part 4BS 565BS 644:Part 1BS 745BS 1186:Part 1BS 1204:Part 1BS 1204:Part 2BS 1210BS 1444