A carrier assembly for a spray device, which carrier assembly comprises a carrier member adapted to be mounted in a cartridge adapter of a spray device, which carrier member has a proximally directed first surface, and a through-hole placing the first surface in fluid communication with the second surface; a micro nozzle having an outlet surface, an inlet surface, and a channel placing an inlet orifice at the inlet surface in communication with an outlet orifice at the outlet surface and wherein the micro nozzle is accommodated and attached to the carrier member such that the outlet orifice is aligned with the through-hole, and wherein the carrier member comprises vent holes formed to allow air to flow between the second surface and the first surface.