31 WETTABLE AIR PERVIOUS FILTER LIKE MATERIAL FOR TREATING VENTILATING AIR, AIR FILTERS FOR HEATING, VENTILATING, AIR CONDITIONING AND KITCHEN EXHAUST SYSTEMS, PANEL TYPE GREASE FILTERS FOR AIR VENTILATING SYSTEMS, FILTERING ELEMENTS FOR THE REMOVAL OF ENTRAINED SOLID AND LIQUID PARTICLES FROM GASES IN ENGINE AIR INTAKE CLEANERS AND FOR SUNDRY USES AS IN AIR VENT, PAINT SPRAY BOOTH AIR DISCHARGES AND THE LIKE