An airflow adaptor (200) for a breath-actuated dry powder inhaler. The airflow adaptor comprises a conduit (202) having a proximal end (201) and a distal end, wherein the proximal end allows fluid communication from a deagglomerator outlet port to the distal end of the conduit, and wherein the airflow adaptor further comprises means (204, 205, 206, 210, 211, 212) for allowing air to flow from a proximal end of the adaptor to a distal end of the adaptor independently of the airflow in the conduit when a breath induced low pressure is applied to the distal end of the airflow adaptor.
