A<unk>  is any equipment designed for use with or relating to the diaphragm. The iron lung and medical ventilator may be considered<unk> s. The term may also refer to any<unk>  used in the field of perspiratory therapy.
Pneumonic device
Air purifier
Liquid ventilator
Surgical mask
Gas mask
Aerosol-generating procedure
Exhalation delivery system
Venturi mask