title: Heat and moisture exchangers and breathing filters.
authors.affiliation: St George's Hospital, London.
authors.forename: R M
authors.initials: RM
authors.lastname: Hedley
authors.forename: J
authors.initials: J
authors.lastname: Allt-Graham
mesh_terms: D000776:Anesthesiology / Q000295:instrumentation*; D001833:Body Temperature Regulation; D003428:Cross Infection / Q000517:prevention & control; D004209:Disposable Equipment; D005374:Filtration / Q000295:instrumentation; D006801:Humans; D006813:Humidity; D012121:Respiration, Artificial / Q000295:instrumentation*; D017155:Wettability