As part of the inspection process, we are required to evaluate and comment on the condition of package units, furnaces and compressor units. Periodically, I come across an older package unit where there is excessive rusting around the exhaust venting for the enclosed built-in furnace. As a rule, I see this condition on units that are typically 12-14 years of age. Depending upon the manufacturer and whether the unit is "contractor grade" one can pretty much assume that there will be excessive rusting in the furnace and probably a cracked heat exchanger.
Depending upon the manufacturer, grade and how well the unit has been maintained over its service life, the expected life expectancy of most package unit furnaces will be in the 12-18 year range. When I see this condition I tell my customers to have the unit serviced and have the furnace checked for cracks or burn-through by a licensed HVAC contractor. Carbon monoxide can be introduced into the home through cracks in the furnace system and can cause asphyxiation. In this area, any cracked or damaged furnace units are "red-tagged" and gas will be shut off to the property until the unit is repaired or replaced.
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