The Puritan Bennett Knight Star 335 is a positive pressure, noninvasive, conventional ventilator designed for use in sub-acute, CPAP, and home care settings. The Knight Star 335 is to be used on adult patients. The three mode settings are CPAP, I/E PAP, and assist control. It is capable of monitoring estimated flow, tidal volume, system leaks, respiratory rate, and I:E ratio. The inspiration and expiration flow-triggered sensitivity adjustments can be made independently for precise respiratory support and comfort. The adjustable delay with ramp allows the patient to fall asleep at reduced pressure.