A file system storing an executive program and a plurality of modules such that when the executive program is executed by a processor the executive program controls the plurality of modules. The pressing mechanism comprises a plurality of deformable press rollers mounted free in rotation about their axis and distributed radially around the forming mandrel so as to fit the periphery of the mandrel. A molded product produced from the weldable resin composition by welding. 0 using an inorganic base such as copper carbonate. Various further embodiments relate to a method and related network node including one or more of the following: determining a first time period for the network update message; setting the first time period as a delay time; waiting for the delay time; and after the delay time has elapsed, computing new routing information based on the network update message. The blower therefore does not suffer erosion and therefore the air cleaning unit enjoys prolonged operation life span.