Dust and debris buildup in return trunks
Why it happens here
Meadow's open space to the west sends fine soil into the air all spring, and the return pulls it in every time the furnace runs. Older flexible duct has ridges that trap that grit, and it builds up year after year until airflow drops noticeably.
Our approach
We clean the return side first under negative pressure, using the HEPA vacuum and flexible whip at lower speeds to protect the liner. We also check the filter slot for bypass, because a poorly seated filter lets that dust straight into the blower.