Hello,
I have central air/heat unit at my home and have been having an odor (smokey, fish odor) emitting from the vents. It is only in the downstairs vents because we have two separate units and zones. I indpected the inside of the furnace and it was clean, no water or tears in the ducting for small creatures to enter. I was wondering if there was something that might allevaite my issue. We noticed this smell a few weeks ago so I decided to change the filter but the smell still occurs. I did not see any burnt wires or anything visible? Any suggestions?