Iso-Guard Hepa Filter Systems offer bidirectional bacterial/viral filtration for cross-contamination protection of the patient, equipment and caregiver. This Light filter is an advanced, highly hydrophobic bacterial/viral filter, HEPA class 13. Suitable for use on pediatric to adult patients. May be used as an HME. Size: 22 mm ID/15 mm OD x 22 mm OD/15 mm ID connectors. Individually packaged, 20/case.