Empire Round Horizontal Vent Termination KitA termination kit is required to finish off your direct vent fireplace. This termination kit can be used with either a top or rear vent installation with a horizontal exit. What's Included 1 x Small round horizontal termination cap 1 x Outside mounting plate 1 x 4" diameter flue tube 1 x 6 5 8" inlet air tube 1 x Wall thimble 1 x Thimble extension Features Horizontal fireplace direct vent kit Use this kit with walls up to 13 3 4" thick It is for use