Allegro Portable Fume Extractor Replacement Filters. This is for a Replacement Filter. The 95% Main Filter. This replacement filter works wih the modle # 9450 Allegro's Filters and Pre Filters are offered in six different combinations and allow maximum flexibility for varying work applications (including HEPA for Hexavalent chromium control and 95% for carbon steel weld fumes). All filters are made in the USA.