ZLINE 61 in. DuraSnow Stainless Steel Chimney Extension for Ceilings up to 12.5 ft. (8KN4S-E)(P) ZLINE 6 ft. DuraSnow Stainless Steel Chimney Extension for Ceilings up to 12. 5 ft. This 72" tall chimney piece must be custom cut to the appropriate size. For use with all ZLINE 8KN4S range hoods. ZLINE's chimney extensions for snow finished stainless steel range hoods make it easy to find a range hood that fits your ceiling perfectly. This 1 Piece Chimney Extension will fit all ZLINE range hoods with model number: ? 8KN4S This 61 inch tall