An inhaler device for the delivery of an inhalable liquid to a patient, said device comprising an elongated body wherein the elongated body comprises: a base end (7, 26); a mouthpiece end (6, 21, 38, 53, 61, 89) comprising a mouthpiece chamber (12, 21a, 41, 90); an air intake chamber (13, 22, 45, 65, 91, 107) for communicating with the mouthpiece chamber upon inhalation by the patient, comprising: (a) a passive evaporation support material (47, 57, 69, 78, 98, 112, 115) for receiving the inhalable liquid from a liquid storage container; and (b) at least one air inlet hole (8, 28, 31, 34); an air exit chamber (14, 23, 42, 84, 100) for communicating with the mouthpiece chamber upon exhalation by the patient, which comprises at least one air outlet hole (9, 40, 54, 62, 77, 95); an internal shelf (16, 25, 44, 51, 82, 93) to partially divide the elongated body along its longitudinal axis from the base end and terminating at the mouthpiece chamber to form the floor of the air intake chamber (13, 22); characterised in that the air exit chamber comprises an air filtering means (15, 24, 43, 63, 75, 83) configured to filter vapour from air passing through the air exit chamber from the mouthpiece end to the at least one air outlet hole; the internal shelf forms the roof of the air exit chamber; and the inhaler device further comprises either: i) a liquid inlet hole (10, 37) for delivering the inhalable liquid from an external liquid storage container into the air intake chamber (13, 22) and onto the passive evaporation support material; or ii) a liquid storage container (111, 114) located within the air intake chamber and positioned to release the inhalable liquid onto the passive evaporation support material (112, 115) when opened. a base end (7, 26); a mouthpiece end (6, 21, 38, 53, 61, 89) comprising a mouthpiece chamber (12, 21a, 41, 90); an air intake chamber (13, 22, 45, 65, 91, 107) for communicating with the mouthpiece chamber upon inhalation by the patient, comprising: (a) a passive evaporation support material (47, 57, 69, 78, 98, 112, 115) for receiving the inhalable liquid from a liquid storage container; and (b) at least one air inlet hole (8, 28, 31, 34); (a) a passive evaporation support material (47, 57, 69, 78, 98, 112, 115) for receiving the inhalable liquid from a liquid storage container; and (b) at least one air inlet hole (8, 28, 31, 34); an air exit chamber (14, 23, 42, 84, 100) for communicating with the mouthpiece chamber upon exhalation by the patient, which comprises at least one air outlet hole (9, 40, 54, 62, 77, 95); an internal shelf (16, 25, 44, 51, 82, 93) to partially divide the elongated body along its longitudinal axis from the base end and terminating at the mouthpiece chamber to form the floor of the air intake chamber (13, 22); characterised in that the air exit chamber comprises an air filtering means (15, 24, 43, 63, 75, 83) configured to filter vapour from air passing through the air exit chamber from the mouthpiece end to the at least one air outlet hole; the internal shelf forms the roof of the air exit chamber; and the inhaler device further comprises either: i) a liquid inlet hole (10, 37) for delivering the inhalable liquid from an external liquid storage container into the air intake chamber (13, 22) and onto the passive evaporation support material; or ii) a liquid storage container (111, 114) located within the air intake chamber and positioned to release the inhalable liquid onto the passive evaporation support material (112, 115) when opened. i) a liquid inlet hole (10, 37) for delivering the inhalable liquid from an external liquid storage container into the air intake chamber (13, 22) and onto the passive evaporation support material; or ii) a liquid storage container (111, 114) located within the air intake chamber and positioned to release the inhalable liquid onto the passive evaporation support material (112, 115) when opened.