Various new products developed by Donaldson Co Inc, AAF International, Ceco Environmental Corp, Osmonics Inc, and Torit DCE are described. Donaldson Co Inc, AAF International and Ceco Environmental Corp have added mail-handling systems to their product lines. Osmonic Inc has introduced a new polyethersulfone (PES) membrane which it claim offers flow and wicking rates of up to twice those of competitive membranes. Torit DCE has developed a new dust collector based on a unique design of elliptical filter cartridge that is claimed to have improved filter efficiency and a longer operating life.