Re: Damsel in Distress needs an Smell Slaying Champion
I'll throw out some thoughts .
Originally Posted by tiffanymlove
Based on the information you provided it sounds as though you have a forced air central heating/air conditioning system.
It's very possible the evap coil ( for the air condintioner ) and the condensate pan located in the supply plenium of the furnace has midew / mold buildup. This is not uncommon and requires an HVAC tech to come out to access and clean the evap coil unit.
This would explain why the smell is noticeable while air is being circulated throughout the ducting.
Another consideration --- if there is a fresh air intake duct attached to the furnace this could also contribute to mildew build within the system as well. This fresh air intake -- which typically is usually a 6 inch round duct connected to the air return plenum with the other end connected to a vent to outside --- is used for make up air ( drawing fresh air from outside ) while the furnace is being used for heating during the cold season.
The issue becomes during the season of hot and humid outdoor conditions -- when you're likely to be using the A/C. Drawing that hot and humid air from outdoors and mixing with the cold air being generated by the A/C could potentionally create mildew within the air handler ( furnace ) and/or the duct work.
During the times when the A/C is being used it wouldn't hurt to close off this fresh air intake to prevent the possible issue mentioned above --- just remember to open the fresh air intake for the heating season.
It probably wouldn't hurt to have the duct work in the home professionally cleaned as well.
This may or may not pertain to your situation --- many years ago there were instances where forced air ducts need to run under concrete slabs --- some installs used round cardboard tubes ( similar to Sono-Tubes used for concrete forms ) . The thought was since metal ducting in contact with the ground and concrete would corrode badly and the cardboard wouldn't corrode. However years later it was discovered the cardboard tubes were found badly deteriorated and having wide open sections to the ground under the slab. This causes issues with foul smells as well.
Hopefully this helps.
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