Sharp FXJ80UW Air Purifier review: Breathe easier in big rooms

The Plasmacluster technology uses a Plasmacluster Ion-Generating Unit on the side of the machine to split water molecules into positively and negatively charged ions that are diffused throughout the room to breakdown germs, bacteria, fungus, mold, viruses and other pollutants, and then return to the air as water vapor. Sharp says this technology reduced 94 percent of E.coli bacteria, 84.3 percent of Staphylococcus Epidermidis, and 87.7 percent of Penicillium Citrinum, a common mold, during testing in in a closed laboratory over a four-hour period.

The purifier has a Clean Air Delivery Rate (CADR) of 334 cubic feet per minute (CFM) for dust, 324 CFM for smoke, and 361 CFM for pollen. CADR reflects the purifier’s effectiveness at removing indoor air pollutants based on room size and the volume of clean air produced per minute. Generally, the higher the CADR number, the more effective the purifier is.

The FXJ80UW includes Amazon Alexa support and enables voice commands for turning the purifier on and off as well as activating its various cleaning modes.

Setup and performance

Before using the air purifier, you must pull off the back panel, remove the filters, take them out of their plastic bags, then reinstall them in the correct order. That done, you’ll replace the back panel, plug the unit in, and turn it on.

You can operate the FXJ80UW from its control panel or remotely with the Sharp Air app for iOS and Android. The app requires you create an account and pair the purifier with your mobile device. That’s usually a straightforward process, but this one was more complex and finicky than most.

When you first log into the app and select the pairing option from the menu, you’re presented with two options: one for routers that have a Wi-Fi Protected Setup (WPS) button and another for routers that don’t. If your router has a WPS button, you just need to press the Wi-Fi button on the FXJ80UW for three seconds until the Wi-Fi indicator on the display blinks, then press the WPS button on your router again and the connection should be complete.

If your router does not have a WPS button, as mine doesn’t, you must complete two setups—the first to connect the purifier to your router and the second to pair your device to the purifier. Connecting the purifier to your router comprises nearly a dozen steps using combinations of control panel buttons to activate various settings. Once the Wi-Fi connection is established, there are a half-dozen more steps to pair your phone. I experienced issues at several steps during the purifier-to-router setup, including dropped connections and the purifier not appearing as a connectable device in my Wi-Fi settings.

Even when I did successfully connect the purifier to the router, I couldn’t get the purifier to pair with my device. Each time I’d get through theprocess, the established Wi-Fi connection would be lost, and the app would return all the way back to the beginning of the Wi-Fi setup. After more than a dozen fruitless attempts, which took about 40 minutes because of the number of steps involved, I had to admit defeat.

That’s too bad because in addition to offering remote control of the purifier and access to your air quality data, connecting the FXJ80UW to your W-Fi network allows you to enable Sharp Cloud, a feature that automatically adjusts the purifier’s sensitivity settings based on your usage history. That allows the purifier to optimize its performance in Auto mode.

App connection problems aside, the FXJ80UW performed well. In Auto mode, the purifier consistently recognized changes in air quality, such as when I was cooking or dusting. At these times, the air quality monitor light would turn red, and the fan speed would increase. After a few moments, the fan would return to a slower speed and the light would shift back toward blue.

In addition to Auto mode, the purifier also offers three manual fan speeds—Low, Medium, and Max—as well as a Pollen mode that increases the dust sensor sensitivity to more quickly detect dust and pollen, and a Sleep mode that reduces operation noise and dims or turns off the display and air quality monitor light based on the ambient light in the room.

Plasmacluster Ion Technology is easily activated or deactivated by pressing in the fan speed button for three seconds. There’s also a dedicated button for Plasmacluster Express Clean Mode, which essentially activates the technology to clean the air for one hour before automatically returning to the previous operation mode, and one for Plasmacluster Spot Mode that removes odor and germs from furniture or clothing placed in front of the purifier.

Customizing what information you want to see on the display, using the timer function, and assigning and changing functions are easy to do once you get the hang of it; but here again, the user manual is indispensable as adjusting most of these settings requires multiple steps using different combinations of controls. It’s not likely you’ll remember many of these on your own, particularly if you don’t change them very often.

Verdict

The FXJ80UW performed well during my daily usage. It consistently responded quickly to changes in air quality, and its temperature and humidity readings matched those on the indoor thermometer/hygrometer I use in the same room. The large air quality monitor light was great for getting at-a-glance status reports from anywhere on my downstairs level. And the purifier is easily the quietest I’ve ever used; in the first few days of use, I often had to walk right up to it to assure myself it was running.

But the complexity and bugginess of the Wi-Fi connection and device pairing process were definite downers. And I was often overwhelmed by this device’s sheer number of buttons, modes, and functions and found myself repeatedly consulting the instruction manual. While not deal-breakers, these are things to seriously consider given the FXJ80UW’s $600 price tag, plus the likely annual replacement of the filters. For the same price, theNuWave OxyPure Smart Air Purifiercan clean the air of a space as large as 1,200 square feet—more than double the max size the FXJ80UW can cover—and offers much more intuitive control. The FXJ80UW is capable, but it’s worth shopping around before you commit.