The P-40 120 volt "Park Model" Ducted furnace utilizes ductwork to provide more even heat distribution througout  the RV. 

And the heavy-duty AC motors and controls mean longer life for the furnace. 

• 40,000 BTUh input  
• Gasket-sealed vent assemblies.
• Energy-saving solid state electronic ignition.
• Steel gas manifolds.
• Sealed forced-draft combustion.
• Stainless Steel vent caps.
• H 12-1/2"" x W 12" x D 23"
• Wall thermostats are not included