(P)The replacement charcoal filters for Professional recirculating kits are for use with 30" and 36" wide hoods.(/P)(P) Model Numbers - CFV13(BR)(/P) (P)The replacement charcoal filters for Professional recirculating kits are for use with 30" and 36" wide hoods.(/P)(P)CFV13 - for use with 30 inch and 36 inch wide hoods(/P)(P)For use with VRK conversion kits. Replacement is recommend every 6-12 months.(/P)(P)Includes 2 filters.(/P)