40K BTU FURNACE Suburban’s NT-30SP, NT-34SP and NT-forty are top examples of ways tough a compact ducted furnace may also be. Introduced in a variety of capacities, as much as 40,000 BTU/h input, all of those 12-volt DC furnaces function power saving cast state electronic ignition. Cupboard dimension is similar on all models. (12 half of” x12″ x 23″) Their extraordinarily low amp draw demands less out of your battery a certain plus for long journeys! Gasket-sealed vent assemblies, steel gas manifolds, sealed forced-draft combustion, chrome-plated vent cap and wall thermostats are same old apparatus. The P-30S and P40, probably the most tough furnaces within the RV trade lately, are a hundred and fifteen-volt park style furnaces, that includes long run heavy duty AC motors and AC controls.