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Hello, if there is a nozzle already in place it will be stamped with a brand and model number, with that information I can search the most popular nozzle vendors for replacement.
Hello, that furnace at over 50 years old is not in any online data bases.
The absolutely correct nozzle will get black and sooty if the fire box has not been cleaned of carbon deposits.... your best bet by a huge margin is simply to clean the fire box of carbon deposits and replace the existing nozzle.
The odds the fire box is at least 50% clogged with carbon deposits on a 50 year old furnace is virtually 100%.
First step will be to examine that first, then clean it... you can buy hard carbon deposit solvent at truck parts supply stores....and the diesel engine service shops.
A clogged fire box reduces air flow, so that fuel burns too rich, leaving carbon deposits.
last caretakers of ABC/Sunray and Oertli parts, this is from 2004, they might still be in business, give them a call, you might get lucky.
Enerjet Corp.*****Bay Shore, NY 11706(###) ###-#### fax:(###) ###-####/p>
They may be gone since they were charged by the FTC for mislabeling equipment three years ago and lost. If they're gone, so is the largest cache of these parts,