Camfil Farr Air Pollution Control (APC) now offers its Gold Series® cartridge dust collector with an optional integrated HEPA safety monitoring filter. Mounted on top of the collector so no additional floor space is required, this after-filter prevents collected dust from re-entering the workspace if there’s a leak in the primary filtering system. Camfil Farr,www.farrapc.com, (800) 479-6801. Circle 339products