Chemical formulation supply unit for a vapour emanating device

The present invention relates to a device for supplying a chemical formulation to a heater unit (50) for vaporising the formulation into an atmosphere, the heater unit (50) having a body housing an internal heating element, the device comprising: a first portion (12) adapted to be inserted through an aperture (52) in said body of the heater unit (50) such that it is at least partially received within said body of the heater unit (50); a second portion (16) configured to store the chemical formulation and being positionable external to the body of the heater unit (50); and a wick element (14) for delivering said chemical formulation from said second portion (16) to an emanation region (27) provided on said first portion (12); wherein, said first portion (12) is configured to be slidingly received by a variety of heater units (50) having apertures (52) of variable configurations, such that the emanation region (27) is optimally positioned adjacent the heating element for vaporisation of the chemical formulation delivered thereto.