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Zen-O features breath sensitivity and Rate Responsive Therapy (RRT) that automatically adjusts to the patient’s demand. Unlike other devices that deliver a fixed amount of oxygen, Zen-O increases the amount of oxygen delivered if a patient’s breath rate rises. The device is designed with a field replaceable sieve bed. The sieve bed is an important part of the device and enables it to produce oxygen. Overtime and depending on operating conditions, the sieve bed may need to be replaced. The Zen-O sieve bed can be exchanged easily using simple tools in under 5 minutes, saving time and money. It is supplied with a 5-year warranty or 15,000 hours of total use, giving you the assurance of quality and reliability.