Ventilator Machine on Rent or Buy Ventilator online. Rental Patient Monitor Machine at an easily affordable price. We care for you that's why we provide the Best Quality Patient Monitor at lowest price. Portable ventilators blow air, sometimes with extra oxygen, into the lungs of a person experiencing difficulty breathing. This is done by inserting a breathing tube into the windpipe (also known as the trachea) of the patient. This pipe allows air into the lungs, bypassing the vocal cords in the process.