Heating, Air Conditioning, Fridge, HVAC/rust before air handler


Hi Joe,
While getting ready to change my HVAC filter, I noticed the following:  In the ductwork after the filter, but before the air handler there was a lot of rust on the bottom and sides of the metal box (ductwork) which is on the floor.  I had noticed this last year, and scraped off as much as I could, and put a yoga mat on the bottom, where most of the rust was to help prevent it from blowing through my system and into my living space.  It seems to have gotten much worse.  Is this a serious problem that should get immediate attention?  I believe it must have started when there were times when there was water on the floor and it seeped inside.  Also, the humidifier is located above the air handler which is above this ductwork, which may have dripped or caused the rust by the humidity inside. Can you please shed some light on what I should do, and how serious a problem this may or may not be.
Thank you,
Mary Ann

Mary Ann,

Yes possible from the humidifier leaking , if you have central air ,your drain line may be partially plugged and the condensate water is overflowing out of your evaporator pan. If you have a wet / damp basement that would also contribute. Ductwork does not typically rot as it's made of galvanized metal.

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40+ years diversified experience.An HVAC/Refrigeration Self Employed Contractor since 1986. NATE Certifield. Answer questions pertaining to Residential and Commercial Air Conditioning , Warm Air Heating, Heat Pump systems.Mechanical and Electrical troubleshooting of these systems.Be as detailed as possible when describing problem.Packaged unit or split systems.No appliance questions.


Installation and Troubleshooting, Mechanical and Electrical, in following areas, Refrigeration ( Walk In and Reach In Coolers and Freezers ) Commercial Roof Top and Packaged Heating/Cooling ( Natural Gas,Propane, Electric, and Heat Pumps ) Computer Room Air Conditoning Systems,Commercial Residential Packaged and Split Systems Air Conditoning and Heat Pumps.Warm Air Oil , Natural and Propane Gas Heating systems.

Graduated from Private Technical School in 1975. An HVAC/Refrigeration Contractor . Have Unlimited Heating/Piping and Cooling Contractor License.Limited Sheetmetal Contractors License.NATE Certifield. York Certifield Master Heat Pump Technician 1986. Served 33 years combination Active Duty Air Force , Air Force Reserves and Air National Guard in the HVAC/Refrigeration Shop/Mechanical Shop. Troubleshooting/Installing HVAC/Refrigeration Equiptment Worldwide. Retiring in 2003 as a Senior NCO ,and a Mechanical Superintendent.

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