Make a decision
Post-renovation inspection versus routine schedule
One scope
An identifiable dusty event can justify a targeted look at filters, blower, coil and affected ducts.
The other scope
A routine calendar date provides no evidence that a hidden section is contaminated.
A concrete example
The day contractors opened ceiling registers during demolition gives a specific reason to inspect affected runs. An annual calendar reminder alone provides no such evidence.
Which question settles it?
Use event history and observed material to determine scope rather than an automatic annual duct bundle.