An assembly for evaporating a volatile material is described, the assembly comprising a device and a refill which are detachable from one another: wherein the device comprises a magnetic induction coil configured to operate with an alternating current passed therethrough at a frequency of between substantially 20KHz to substantially 00KHz and one or more volatile fluid emanation channels containing at least one piece of heat- conducting, non-magnetic metal foil and/or deposited heat-conducting, non-magnetic metal and wherein the refill comprises at least one magnetic susceptor having a coercivity of substantially 50 ampere/metre (H
