What size room does the FP-K50UW handle?

Sharp rates it for 259 sq ft at 4.8 air changes per hour, or up to 1,253 sq ft at one air change per hour. For allergy relief, stay near the 259 sq ft figure.

How often do the filters need replacing?

Sharp says the True HEPA and activated carbon filters last up to two years depending on the environment. The microscreen pre-filter is permanent and washable.

Does it have app or remote control?

No. It has no app, remote or air quality indicator light. You control it with the onboard buttons for Max, Med, Sleep and Express Clean.

The maximum noise level is 51 dBA. Sleep mode is much quieter, which is why most owners run it overnight.

Where is the Sharp Plasmacluster Ion Air Purifier cheapest?

At Amazon, for $179.99, 25% under what the other stores charge, as of our latest check.

What do buyers say about the Sharp Plasmacluster Ion Air Purifier?

Rated 4.4 out of 5 from 9 ratings.

Where can I buy the Sharp Plasmacluster Ion Air Purifier?

3 stores we checked sell it, including Best Buy, shopappliancewerks.com, Amazon.

Sharp Plasmacluster Ion Air Purifier

Q: Is $179.99 a good price?

At $179.99 at Amazon as of November 6, 2026, it is at the low end of its recent range, with three stores pricing it new. That is a fair price for a two-year-filter True HEPA unit.

Q: What comes in the box?

The box includes the purifier, a True HEPA filter, an activated carbon deodorizing filter and a permanent washable microscreen panel.

Best price now

$179.99at AmazonObserved at 5:39 AM

25% under what the other stores charge

Compared across 3 stores. Prices are checked against each store and labelled with when.

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Our take on the Sharp Plasmacluster Ion Air Purifier

The Sharp Plasmacluster FP-K50UW is a floor-standing True HEPA air purifier for medium rooms, rated for 259 sq ft at 4.8 air changes per hour. It combines a True HEPA filter, an activated carbon deodorizing filter and Sharp's Plasmacluster ion technology, with three fan speeds plus an Express Clean mode that shuts off after an hour. Filters are rated to last up to two years, and it is ENERGY STAR and CARB certified. At $179.99 at Amazon as of November 6, 2026, it sits at the low end of its recent range, with three stores pricing it new.

What reviewers say

Owners of Sharp Plasmacluster purifiers generally report cleaner-feeling air and quiet overnight operation. Complaints center on the lack of smart features and the fan noise at the top speed.

What people mention

NoiseMixedOwners find sleep mode quiet but say max speed is clearly audible at 51 dBA.
FiltrationPraisedThe True HEPA and carbon filters are said to reduce dust, pollen and odors.
Filter lifePraisedFilters lasting up to two years are seen as a low running cost.
FeaturesCriticisedBuyers miss an air quality indicator, app control and a remote.
SetupPraisedOwners describe unboxing and filter installation as quick and simple.

About the Sharp Plasmacluster Ion Air Purifier

The Plasmacluster 7,000 Series FPK50UW Air Purifier by SHARP is your ideal choice for medium-sized rooms. Effective up to 1,253 sq. ft. at one air change per hour, the FPK50UW will filter the air in the AHAM Suggested Room Size of 259 sq ft. at 4.8 air changes per hour. The SHARP long-life True HEPA filter and the long-life Activated Carbon filter last up-to 2 years, depending on the environment. The FPK50UW meets the strict energy efficiency criteria to earn the ENERGY STAR Rating. The FPK50UW is AHAM Verifide Tested to provide a Clean Air Delivery Rate (CADR) for three common irritants and allergens, Smoke (167), Dust (171), and Pollen (188). It is certified by the California Air Resources Board (CARB) to meet its strict emission standards. Finally, the True HEPA filter effectively captures 99.97% of particles from the air that Passes Through the Filter from 0.3 microns and larger.