Baghouse filter cages provide support to your filter bags. Baghouse cages typically consist of 10, 12 or 20 vertical wires. The horizontal ring spacing on the cage can be 4 inches, 6 inches or 8 inches. The cages can be made of different materials, usually galvanized steel or stainless steel. Most cages are either rolled flange and venturi for top load units or split collar for bottom load unit.