Cross References:BS 1474BS 3900-F2BS 4787-1BS 4873:1986BS 5368-1BS 5368-2:1980BS 5368-3:1978BS 6262-4BS 6375-1:1989BS 6496 BS 7412:1991BS EN 204:1991BS EN 300BS EN 312BS EN 350BS EN 622BS EN 635BS EN 755BS EN 942BS EN 951:1999BS EN 1027:2000BS EN 1121:2000BS EN 1670BS EN 12219:2000BS EN ISO 7253BPF Standard. Infill panels for doors and windows. Reference 355/1:1996BPFWG Code of practice for the reinforcement of windows and doors. Reference 323/1:1991BPFWG Guidelines for the selection and application of fasteners for windows and doors. Reference 335/3:1996Building Regulations 1991Building Regulations Scotland 1990Building Regulations (Northern