Search·AirDoctor
When you already know your purifier’s model number, this page shows the replacement filter numbers we match to it—then you can compare with your old filter and shop.
Brand
AirDoctor
Model AD3500
AirDoctor AD3500 4-in-1 Air Purifier
Series: AirDoctor
These filter part numbers are matched to this air purifier model in our reference. Compare the OEM number with the label on your current filter or your owner’s manual before you buy.
Your replacement
ADF401
AirDoctor 4-in-1 UltraHEPA + carbon replacement
Replace about every 12 months
All details for this part (notes, compatible models, buying options when listed)
Notes & next steps
Search again if you need a different model or part number.
Distinct AirDoctor sellable unit; genuine ADF401-class 4-in-1 replacement is listed for AD3000 and AD3500 (confirm model on label).