No person may use for the purpose of practicing barbering any room or place which also is used for:
unless a substantial partition of ceiling height separates the portion used for residential or business purposes from the room used for barbering. A barbershop may be operated in conjunction with a beauty shop, shoe shining parlor, or agency for the reception and delivery of laundry without the separation thereof by a partition of ceiling height.
N.D.C.C. § 43-04-43