(P) ZLINE Recirculating Kit for an Under Cabinet Range Hood. An efficient recirculating system that uses a charcoal filter to trap smoke, grease and odors at the source and recirculate air, no ducting required. (/P)(P) The compatible models are listed below: (/P)(UL)(LI) RK-30: Compatible with models 520-30, 523-30, 527-30, 619-30 and 623-30 (/LI)(LI) RK-36: Compatible with models 520-36, 523-36, 527-36, 619-36 and 623-36 (/LI)(LI) RK-42: Compatible with models 520-42, 523-42, 527-42, 619-42 and 623-42 (/LI)(LI) RK-48: Compatible with models 520-48, 523-48, 527-48, 619-48 and 623-48 (/LI)(/UL)