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About the scoresThe scores are calculated mechanically by applying the criteria table at the end of the page to figures published on the manufacturers' official pages and manuals (and on retail or comparison pages where an official figure was not available). We call it the "Spec Score".
Spec Score #3Air purifier (3D Nano Charge HEPA, no humidifier)
Best for a quiet, affordable unit in a bedroom or single room
3.25★★★☆☆Spec Score (out of 5)
See on Amazon¥11,270See on Rakuten¥11,000Price as of 2026-09-09 · affiliate link · Opens the shop's site
We could not open the Iris Ohyama official site (access denied), so the figures for this product come from Amazon, Rakuten Ichiba, Kakaku.com and OCN Online Shop pages that match the exact model AAP-S30C-W. The 2-year filter life is from Kakaku.com.
Score Breakdown
Specs
| Type | Air purifier (3D Nano Charge HEPA filter, no humidifier) |
|---|---|
| Room coverage | About 16 tatami mats (about 26 m², on High) |
| Air flow | Low 0.5 / Medium 1.3 / High 2.6 m³/min |
| Operating noise | Low 19 / Medium 31 / High 46 dB |
| Power consumption | Low 2 / Medium 5 / High 19 W |
| Filter | Dust and deodorizing filter (99.97% of 0.3 μm particles) / life about 2 years (Kakaku.com) |
| Care | Vacuum the intake about once a month / filter-replacement lamp |
| Extra features | Auto mode (senses odor and dirt), sleep mode, 3 fan speeds |
| Size / weight | Ø about 23.8 × H 41 cm, about 2.5 kg |
🙂 Good points
- 19 dB and 2 W on its lowest setting: quiet, and lower power than the Sharp (3.1 W) and Daikin (10 W)
- Senses dirt and odor and adjusts the fan automatically
- Light at about 2.5 kg, and the lowest price of the four as listed (2026-09-09)
🙁 Things to note
- Rated coverage is about 16 tatami mats (High), on the smaller side
- Filter life is 2 years (per Kakaku.com), so budget for replacements
Sources
Amazon [retail page] ／ Kakaku.com [comparison site] ／ Rakuten Ichiba [retail page] ／ OCN Online Shop [retail page]
Scores are calculated only from specs published on official and retail pages.