Applies in conjunction with the "Basic Rules" of DIN 1946 Part 1. It contains more far-reaching provisions which must be observed in connection with vehicle interiors if satisfactory ventilation is to be achieved despite the smallness of the vehicle spaces and other complications. Vehicle spaces within the meaning of these Rules are primarily spaces occupied by passengers. The Rules should, however, also be applied as far as possible to staff rooms and operating premises occupied by personnel for considerable periods.