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The Dometic Duo-Therm RV Air Conditioner Heat Strip, model 331498.000, is a 120V non-ducted heating unit designed for use in recreational vehicles (RVs). This heat strip is part of the Dometic Duo-Therm air conditioning system and provides supplemental heating for the RV's interior. The heat strip is a non-ducted unit, meaning it does not require ductwork to distribute the heated air throughout the RV. Dometic 3314998.000 Non Ducted Heat Strip is designed to fit Dometic Brisk Air and Penguin II non-ducted RV air conditioners.