Profile: BWF is a manufacturer and marketer of standard and specialized dust collector bags, liquid filter cloths, belts, covers and a broad spectrum of filter media. We offer dust bags in four basic designs such as pulse jet (bottom loader or bottom removal), pulse jet (top loader or top removal), shaker design and reverse air design. Our pulse jet bags are cleaned using compressed air to mechanically pulse or snap the bag periodically so that the built up filter cake is discharged and the flow through the media is returned to its higher in-service permeability. Pulse jet bags are installed on wire cage supports and filter from the outside/in. This holds true for either top load or bottom load design baghouses. In the bottom load design, bags are pre-installed on their cages and then attached to a mounting thimble or cup, which hangs down from the underside of the tube sheet. The tube sheet is a metal plate with regularly spaced holes, which serves as the top of the gas tight metal box known as a dust collector. The top edge of the bottom-loading bag is normally tucked into the cage and the entire assembly is attached to the thimble or cup with a hose clamp.