11 Parts and engineered systems for industrial installations for air pollution control in bag houses,namely, air filters, filter bags and cartridges for filtering particulate laden air, cages, acoustic cleaning horns, and accessories for air pollution control bag houses, namely, collectors, blowers, ducts, baffles, door seals, conveyors, dampers, airlocks, tubes, clamps, gauges, torsion and conical tensioning springs, valves, tube sheet seals, evaporative gas conditioners, humidifiers, weights and leak detection systems, all sold as a unit as part of the air pollution control bag houses