RT Journal Article SR Electronic T1 CORRECTION JF Respiratory Care FD American Association for Respiratory Care SP 978 OP 978 VO 54 IS 7 YR 2009 UL http://rc.rcjournal.com/content/54/7/978.abstract AB In the article “Airway humidification during high-frequency percussive ventilation” by Allan PF et al (Respir Care 2009;54[3]:350–358350–358), the units of measurement for absolute humidity are in error. The correct units for absolute humidity are mg/L, not g/L.