Non-invasive ventilation is done with devices external to the body. It can be used as needed during the day or night and can be easily removed when not needed. Often, it's used during the night and intermittently or not at all during the day, at least at first. Later, it may be needed all the time. The mask should fit snugly over the boy's face.
Modern ventilators come in many forms.
Your doctors and respiratory therapists will help you decide what kind of ventilator to get and how to use it. Experts in ventilation recommend a custom-designed mask, so that it fits very snugly but comfortably over the face. There are many kinds of masks available. You can also deliver assisted ventilation only through the nose or only through the mouth, using different kinds of devices. As pressure decreases outside the lungs, the lungs naturally expand.