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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 #2Humidifying air purifier (Plasmacluster 7000)
Best for handling humidifying and air purification quietly in one unit
4.00★★★★☆Spec Score (out of 5)
See on Amazon¥24,980See on Rakuten¥32,800Price as of 2026-09-09 · affiliate link · Opens the shop's site
KC-J50C is a model number for online sales and we could not find a Sharp product or spec page for it, so we use the spec table in the official KC-J50C manual. Room coverage also matches the retail pages (Amazon, Rakuten Ichiba).
Score Breakdown
Specs
| Type | Humidifying air purifier (Plasmacluster 7000) |
|---|---|
| Room coverage | Air purifying up to 23 tatami mats (38 m²) / humidifying purifying: prefab up to 14, wood-frame up to 8.5 / Plasmacluster about 13 |
| Clean-up time | 12 minutes for an 8-tatami room (purifying, High) / 17 minutes (humidifying purifying, High) |
| Air flow (purifying) | High 5.1 / Medium 2.8 / Quiet 1.0 m³/min |
| Operating noise (purifying) | High 52 / Medium 38 / Quiet 20 dB (humidifying: 42 / 35 / 20 dB) |
| Power consumption (purifying) | High 54 / Medium 13 / Quiet 3.1 W (humidifying: 20 / 11 / 3.6 W) |
| Humidifying | Up to 500 mL/h (High), tank about 2.5 L, continuous humidifying about 5.0 h on High / about 12 h on Quiet |
| Filters | Dust, deodorizing and humidifying filters about every 10 years; Ag+ ion cartridge about once a year; disposable pre-filter about once a month |
| Care | Humidifying filter about once a month / rinse the tank at every refill / vacuum the pre-filter on the rear panel |
| Extra features | Auto mode, powerful dust-collection mode, pollen mode, sleep mode, filter-care lamp |
| Size / weight | W399 × D230 × H613 mm, about 7.5 kg |
🙂 Good points
- Rated for 23 tatami mats of air purification (humidifying: 8.5 wood-frame / 14 prefab)
- Quiet and low-power at its lowest setting: 20 dB and 3.1 W
- Dust and deodorizing filters are rated for replacement about every 10 years
🙁 Things to note
- Its top setting is 52 dB and 54 W, a big gap from the quiet mode
- When humidifying, you must refill the tank and care for the humidifying filter and tray
Sources
Sharp official manual (PDF, KC-J50C) ／ Amazon [retail page] ／ Rakuten Ichiba [retail page]
Scores are calculated only from specs published on official and retail pages.