Powder coating system

A powder barrier adapted for use in a compressed air path of a powder coating system in which compressed air is passed from a source to a powder feed duct, said powder barrier comprised of a tubular housing of a material impermeable to compressed air consisting of two housing parts which are arranged axially to one another and detachably joined together to form an interior chamber, said housing having an inlet port in one of said housing parts adapted to be connected to receive compressed air from the compressed air source and an outlet port in the other of said housing parts adapted to be connected to deliver a flow of compressed air to said powder feed duct, a beam detachably secured to one of said housing parts to position said filter element in said interior chamber when said housing parts are secured together, and at least one filter element of a microporous material which is permeable to air and not to coating powder secured to said beam between said inlet and outlet ports whereby said ports communicate with one another fluidically only through said filter element, said beam having conduits communicating with said inlet port and which are adapted to deliver compressed air from said inlet port to one side of said filter element, said filter element preventing powder penetration from the powder feed duct to the compressed air source in a direction opposite to the flow direction of compressed air in the compressed air flow path, wherein said inlet port is a threaded opening extending through one of said housing parts, and wherein said beam is threadably secured to said threaded inlet port.