Replacement filter · large-room air purifier
Honeywell HPA300: replacement cartridge
The Honeywell HPA300 takes 2 cartridges. Here is which part fits each stage, the current price, how often to swap it, and what it works out to per year - $154/yr on our engine's math, so you can decide before you are standing at the sink with a leak.
What it costs to keep running
- Annual filter cost
- $154/yr
- 5-year total
- $1038
This is the same figure our scoring engine uses on the Honeywell HPA300 scorecard, computed from each filter's price and yearly replacement count. Prices last checked 2026-05-29.
The cartridges it takes
HRF-R3 True HEPA Replacement (3-pack)
$89.95- Replace
- 1x per year (about every 12 months)
- Price checked
- 2026-05-29
This model takes the brand cartridge; we found no confirmed generic equivalent, so buy the part that matches the number above.
HRF-AP1 Pre-Filter A
$15.95- Replace
- 4x per year (about every 3 months)
- Price checked
- 2026-05-29
Generic and third-party cartridges fit this model, so you are not locked into the brand part. The reorder link searches the exact part string, which surfaces both the OEM cartridge and compatible equivalents.
Reorder links are Amazon affiliate links: FilterScored earns a commission at no extra cost to you. Affiliate relationships never influence a score, which is computed by an engine from published specs and verified certifications.
Prices and part numbers are the ones we last verified from the manufacturer or a retailer listing on the dates shown; check the current price at the link before reordering. The annual figure is our engine's computation from that data, not a statement of what you will pay.
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