Napoleon Hot Air Distribution Kit for Gas Fireplace (LHAD) w89 DRIFTWOOD LOG SET Size:(52" x 16" X 8") DRIFTWOOD LOG SET Center of Vent to Nearest Outside Corner of Building or Obstruction 16" Center of Vent from any Opening through which Flue Gases Could Enter a Building 9" Bottom of Vent above Grade 12" Edge of Vent to Nearest Projecting Surface 6" Vent Projection from Outside Wall 4" Center of Flue to Floor Covering 19 3 8" Safety Control Pilot and Main Burners include Automatic Shut off Warranty Effectively distributes hot air from unit to heat adjacent rooms It manages heat produced by the fireplace by expelling it safely and efficiently into the areas of the home that you wish to heat