Breathing circuit, ventilator, and patient interface not included.
About these filters
When a person breathes through a ventilator circuit, the normal warming and humidifying job of the nose and upper airway is bypassed. An HME restores some of that passively: as the patient exhales, the HME media captures warmth and moisture; on the next inhalation, that warmth and moisture are returned to the delivered gas. This helps keep secretions from drying out and makes therapy more comfortable, without needing an active heated humidifier.