Aha, I misunderstood, I thought we were talking about the dryer duct but actually we are talking about the heater ducts. I checked inside the heater ducts from various places and mine look almost completely new, house built in 2007. Not sure why, but the furnace filter is always changed on schedule. I also check the air quality in the house which is nearly always very good. Perhaps it’s the way the house was built.
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