A particle producing apparatus includes a reaction container, an introduction portion for introducing a source gas and a reaction inhibitor generating gas into the reaction container, an inert gas introduction portion for introducing a carrier gas into the reaction container, a heater provided on the reaction container, and an exhaust portion. The array includes a plurality of rows of fastener elements arranged such that, in each row, all of the crooks face in the same direction and parallel to the direction of the row, with the crooks of adjacent rows facing in opposite directions. While concurrently displaying the first row and the second row, the device detects a first input that corresponds to movement in a second direction. A decimal mass filter is applied to one or both sets of data. The entrance end 28 of the fuel supply conduit 26 is disposed axially upstream of the upstream most surface 40 of the deflector body 38.