Within the Heating and Cleanroom Technology Standards Committee (NHRS) standards for planning, construction, acceptance and periodic testing of ventilation and air-conditioning systems in special rooms are drafted. This includes, among other things, buildings and rooms in the health care system which must be supplied with air for reasons of infection hygiene or occupational hygiene, as well as rooms directly connected to them by doors, corridors, etc. Areas of application include hospitals, day clinics, nursing homes, intervention rooms in doctors' surgeries, outpatient operation centers/facilities, dialysis centers and facilities for internal and external (service) units for the reprocessing of medical products.