The gas filter can be applied to all kinds of gas (natural gas (LNG), liquefied petroleum gas (LPG), city gas, biogas) and other non-corrosive gas and air pipeline network. It is not only widely used in hybrid or composite burner gas supply pipeline network, but also for industrial, non-industrial gas, biogas, natural gas (LNG), liquefied petroleum gas (LPG), non-corrosive gases and air and other gases supply pipeline network or branch network.