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User Manual: C16 Series. Old Nomenclature -14 -21 -26 -31 -41 -46 -51 -65 -81 BTU = TONS = 1 ton = 1½ tons = 2 tons = 2½ tons = 3 tons = 3½ tons = 4 The Lennox C-16 is a gas furnace designed for home use. It is a fairly large unit that connects directly to your home venting. We've made it easy for you to find the resources you need, including product brochures and owner's manuals. Simply narrow your search using the options below. View & download of more than 7892 Lennox PDF user manuals, Air Conditioner, Heat Pump user manuals, operating guides Collection XC21 System.Lennox® Furnace Service Manuals. Click on Your Model Number Below to View the Service Manual for Your Unit. Click Here to Watch a Video on How to Locate Find Lennox Commercial HVAC product service manuals, installation guides, engineering handbooks, application and design guidelines.