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https://suburbanrv.com/service-suppo...-model-number/
The model number and serial number information can be located by removal of the painted metal grille secured to the furnace. The metal grille can be detached by removing the two screws from the front of the grille. The silver colored data plate with black printing will be located on the right side of the furnace combustion chamber assembly as you look at the appliance. The model number will be located on the data plate and will begin with "NT", "GT" or "DD". The serial number will have nine digits.