Ventilators are the instruments needed to perform the mechanic ventilation procedure. Mechanic ventilation is the artificial method in replacement of normal ventilation and can save lives. In some situations, body is unable to keep respiratory cycle, what means, the process of breathing in and breathing out. It is used in cardiopulmonary resuscitation, medicine of intensive and cornice treatment and anesthesia. During the non - invasive ventilation, one uses a face - adapted mask, connected to a ventilator that creates an air flow. In the Invasive Ventilation, the patient needs to use a stent of tracheotomy or orotracheal. In both cases, the choose of the best mechanic ventilation instrument will contribute for therapeutic success.