While producing the equipment, the MES Ltd company places special emphasis on the patient's protection against infections. The pneumotachographic head that we have patented offers the possibility of using sterile measurement elements for each patient during the basic spirometric examination. The new construction of shutter for the RRS, P0.1 and Bodyplethysmography examinations is a development based on the idea of easy sterilisation of elements used during the examinations in the area of respiratory mechanisms. The idea reinforcing the construction of new shutter is the elimination of potential threats of infection during the examination performance. Similarly to our pneumotachographic heads, the replaceable shutters are entirely sterilised. The replacement of the shutter and the head is always done before starting the examination of a new patient. The replacement and sterilisation of shutters is possible without the need of complicated component elements' dismounting. The low cost of the closing element mounted to the drive will allow the users to safely conduct RRS, P0.1 and Bodyplethysmography examinations of many patients in a short period of time without the need for long breaks for dismounting, cleaning and sterilisation of the shutter.