Home Office Room Automatic Heavy Duty Door Closer 45-75kg for LCN 1070, Norton 1600, Dorma 7300 Our commercial door closer will make it solved. Designed for a maximum door size of 44" Interior and 36" Exterior with a maximum door weight of 243 lbs this commercial door closer is suitable for various doors, such as LCN 1070, Norton 1600, Dorma 7300, Dor-O-Matic SC60 and so on