Blueair Classic 203 Slim Air Purifier VS. KOIOS Large Air Purifier

All its filters use HEPASilent-technology that features a unique combination of electrostatic and mechanical filtration in-order to remove 99.97% of airborne-particles down to 0.1-microns in size.

Uses a SmokeStop-filter with activated-carbon to capture and remove odors caused by cigarette-smoke and other VOCs. However, this filter is sold separately.

Designed for use in small-to-medium rooms between 200sq.ft and 300sq.ft. It also has a Clean-Air-Delivery-Rate (CADR) of 155 cubic-feet-per-minute with superior 5 air-changes per hour.

Comes with a Particle-Filter with HEPASilent Technology to capture 99.97% of germs and other airborne-pollutants down to 0.1-microns in size.

Uses HEPASilent Technology with particle filtration and electrostatic charge to capture 99.97% of airborne pollutants including; dust-mites.

It uses a Particle-filter with HEPASilent Technology to capture and remove 99.97% of airborne pollutants including pet-dander.

It can remove 99.97% of airborne-pollutants including pollen using an advanced particle-filter with HEPASilent-Technology.

It uses an optional SmokeStop filter with activated carbon to trap and remove smoke and other VOCs within your home.

It can trap and remove 99.97% of airborne-pollutants including mold-spores using an advanced Particle Filter with HEPASilent-Technology

Uses HEPASilent Technology with particle filtration and electrostatic charge to capture 99.97% of Allergens and other airborne-pollutants.

It uses advanced filter-media that requires less air-pressure and allows for high airflow-efficiency with whisper-silent performance. Additionally, all its filters are equipped with HEPASilent-Technology.

Its filters are very easy to access and replace by simply removing the back-panel. In fact, you don't need any professional-help or complicated tools to replace filters.

This device can be set to the lowest speed-setting to ensure whisper-quiet operation thus making it perfect for use in bedrooms and offices.

This unit uses only 20-watts on the lower speed-setting and 80-watts on the highest speed-setting which actually makes it very energy efficient.

Energy star rated for best in class energy consumption. In fact, it uses only 20-watts on the lowest fan-speed and 80-watts at the maximum fan-speed.

This device features 3 fan-speeds and an off-function which is all controlled by a dial-button. It also features a LED-light at the top-section.

Comes with a timer that alerts you when the filter needs to be changed. This magnetic-timer will allow for easy attachment to the unit.

It uses only 20-watts on the lowest fan-speed and 80-watts on a maximum fan-speed. This makes it very energy-efficient and economical.

It’s somehow affordable compared to other air-purifier models within its range.

It can actually battle asthma and other allergies using its True HEPA filter which can capture 99.97% of airborne-pollutants.

It’s recommended to replace filters every 6-months depending on regular use.

It’s certified by the California Air Resources Board for being ozone-free which implies that it won't emit any toxic-gasses into the environment.

It has a slim and classic tower-shape, control-dial on one-side, air-inlets at the back and air-outlets at the top coupled with a simple LED-light.

Has a dimension of: 21"H x 17"W x 8"D coupled with a metallic tower-shaped body with a control-dial on one-side and a nice looking white-black color.

It weighs about 25-lbs (11-kgs) which makes it a bit lightweight and easy to carry using a convenient handle.