The Faber Ductgrt36 Ductless Vent Grate Kit Is A 4-In. Tall Ductless Vent Grate. It Is Compatible With The Magnum And Pellicano Model Hoods And Is Used To Recirculate Air Back Into The Kitchen When Ducting To The Outside Of The House Is Impossible Or Impractical. This Kit Allows You To Recirculate Filtered Air Back Into The Kitchen Through The 4-In." Tall Stainless Steel Vent Kit With Grates. The Kit Consists Of The Stainless Steel Vent And A Pair Of Charcoal Filters That Are Installed On Either Side Of The Motor To Filter Odors From The Air Before Coming Back Into The Kitchen.