Fire Magic 3280P Fire Magic Single Side Burner Counter Top Drop In Liquid Propane vent_ducted (Ul)(Li)Best® Interlocked Make Up Air Dampers (Ul)(Li)Best® Interlocked Make Up Air Dampers Provide Outside Air When Required To Keep The Air In The Home Fresher By Allowing The Range Hood To Operate At Optimum Levels( Li)(Li)Universal Design Works With Any Best® Range Hood To Balance Indoor Air Pressure By Providing Interlocked Make Up Air Without Requiring A Direct Wire Connection Between The Range Hood And The Damper 000 Btus Are Readily Available On A Tri Ring Burner For Perfect Searing And SautéIng And Manifold Assemblies Are Warranted For Fifteen (15) Years From The Date Of Purchase Of Your Fire Magic Grill Electronic Components (Including Lights And Thermometers)