Fully Metallic Dry/ Viscous Filter is applied as a pre filter in air conditioning and ventilation system. The Metallic Filter is encased in a mild steel frame and guarded on one side by expanded metal and oil is sprayed to make it viscous. The Metallic Dry/ Viscous Filter features 5 or more layers of wire mesh of different mesh sizes that are stitched together and pleated. Fully Metallic Dry/ Viscous Filter can perform under initial pressure drop rate of 4 to 5 mm of WG.