Air filtration equipment for industrial, commercial and domestic use, namely in-line air filtration units namely, internal filters for removing dust, smoke, odors and gases from air flowing in ventilating ducts and conduits; dust containment modules namely internal filters for removing dust, smoke, odors and gases from ambient air; mounting frame assemblies for supporting air filters as a component of air filtration units; high efficiency cartridge filters for use in air filtration units to r...