The first layer catches hair, lint and larger dust before it reaches the carbon and HEPA filters. Rinse it, dry it fully and put it back, which keeps the costlier filters working the way they should.
This is the filter that traps what you cannot see, like pollen, dust and pet dander. Plan on replacing it roughly every twelve months, with the unit reminding you when the time arrives.
PlasmaWave is a low-voltage ionization step designed to reduce airborne pollutants while producing far less ozone than conventional ion generators, adding cleaning power without the concern.
Two sensors track air quality and room conditions, and auto mode responds to what they read. The air quality indicator gives you a visible read on whether the room is holding or improving.

Dual smart sensors read the room and an air quality indicator shows what they find, so the unit shifts speed on its own instead of waiting for you to notice the air went stale.

The quietest setting runs at 26.2 dB, and automatic sleep mode dims the unit and slows it down at night, so a bedroom stays dark, calm and still getting cleaned air.

An activated carbon layer works alongside the True HEPA filter to reduce everyday smells from cooking, pets and smoke, which matters most in kitchens and shared living rooms.

AHAM verified at 522 sq ft, the 9800 delivers about 4.8 clean air changes per hour there and can cycle a room as large as 2,506 sq ft once in a single hour.

WiFi plus Alexa support lets you check status, change modes and monitor the unit through the Winix Smart App, handy when you are away or standing in another room.

The pre-filter is washable, the carbon filter lasts roughly three months and the True HEPA filter about twelve, with a replacement indicator so upkeep stays predictable.

Automatic sleep mode dims and quiets the unit when the room darkens, so overnight cleaning stays at a low 26.2 dB. One owner did note that auto mode drops out in a fully dark room.

Owners report visibly dustier filters after weeks of use, which is exactly the point. The True HEPA stage works on dander and fine dust while the pre-filter catches hair and lint.

One owner cleared a burned kitchen smell quickly. The activated carbon stage is what does that work, which makes the 9800 useful in cooking spaces and open kitchens.

A verified 522 sq ft rating covers most apartments, and owners say a single unit handles the space well. WiFi control adds convenience without pushing the price premium.

Cycling a 2,506 sq ft room once per hour makes the 9800 practical for open living areas and larger bedrooms where a smaller unit would fall behind the airflow.

Owners coming from earlier Winix models call the 9800 a clear step up, and one buyer purchased three. The filter layout stays familiar while WiFi and dual sensors are added.
