Clinker, along with additives, is ground in a cement mill. The output of a cement mill is the final product viz. Cement. In a cement mill, there is a cylindrical shell lying horizontal which contains metallic balls and as it rotates, the crushing action of the balls helps in grinding the clinker to fine powder.The term bag house is applied to large filters containing a number of tubular bags mounted in a usually rectangular casing. The dust laden air is drawn through them by suction.The bag house is used to remove dusty particles from discharge of different equipment such as cement mill, coal mill and kiln. In a bag house system discharge gas containing dusty particles is passed through a series of bags made of strong fabrics.