Portable Ventilator for Invasive/ Non-Invasive Ventilation is made using quality grade materials to ensure reliability. The Portable Ventilator is both a volume-control and pressure-control ventilator for invasive and non-invasive ventilation. The Portable Ventilator has the ability to compensate for leaks in both pressure and volume control modes, using simpler passive circuits may support significant time and cost savings. The Portable Ventilator for Invasive/ Non-Invasive Ventilation supports either active or passive exhalation breathing circuits to accommodate changes in circuit preference.