An air treatment device is described comprising: a housing having at least one air inlet and at least one air outlet with at least two discrete air passageways therebetween; wherein in a first of said passageways there is located a fan and at least one air filter retaining means arranged to releasably retain, in use, an air filter within one passageway; and wherein in a second of said passageways there is located at least one refill securing means arranged to releasably securing a refill of air treatment agent and emanation means in the form of one or more heaters; and wherein, in use, airflow through said at least two passageways is separate.