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Depiction of the HCH filter in isolation and as part of the ventilator circuit. Panel a, at left, shows an example of the HCH filter unit that stands roughly two inches tall and less than an inch in diameter. The sponge can be seen at its center. Panel b, at center, shows a photograph of the HCH filter relative to the Y-valve and the endotracheal tube insertion point - blue cap. The schematic at right indicates the airflow and ancillary HEPA filters within the ventilator circuit.
