Alen T500 HEPA Air Purifier VS. Bissell air400 Air Purifier

Comes with a HEPA Pure filter that captures 99% of airborne particles down to 0.3 microns in-order to keep your house clean.

It has a Pre-set timer/scheduler that allows you to select between 4, 8 and 12 hours of operation before the device shuts-off.

It can use an optional, Fresh Antimicrobial True HEPA Filter to trap and eliminate cigarette-odor. However, this filter is not included with the package and it’s sold separately.

It can clean air in small-to-medium sized rooms of up-to 500Sq.Ft every 30-minutes and also features a directional air-flow that allows it to act as a tower fan and air-filter at the same time.

It uses a Pure True HEPA Filter to capture 99% of airborne-particles like germs from your home-environment.

Uses a Pure HEPA Filter to capture 99% of dust-mites and other airborne-particles down to 0.3-microns.

Can effectively capture and eliminate 99% of airborne-pollutants including pet-dander using an integrated Pure True HEPA Filter.

The Pure True HEPA Filter helps to eliminate 99% of airborne-particles including pollen in-order to keep your home fresh and clean.

Uses an optional Fresh True HEPA Filter to capture and eliminate smoke from your house. However, this filter is sold separately & isn’t included in the package.

Can trap and eliminate mold-spores and other airborne-pollutants at an efficiency of 99% so as to keep your house fresh.

Captures 99% of allergens and other airborne-particles down to 0.3-microns using an integrated Pure HEPA Filter.

Uses WhisperMax-Technology to emit a low-frequency noise referred to as pink-noise so as to ensure silent-operation at the lowest speed-setting.

Features a washable Pre-Filter that captures large-particles in-order to extend the life of the Pure Hepa filter.

It comes with a standard HEPA-Pure Filter that is very easy to replace by simply removing the back-cover on the unit without needing any special-tools.

It features a sleep-mode that operates at lowest speed-setting using WhisperMax Technology in-order to ensure optimum-silence so that you can rest comfortably at night.

It uses 53-watts on the highest speed-setting and 30-watts at the lowest speed-setting making it very energy efficient.

It’s very energy-efficient because it uses the same amount of electricity as a 50-Watts light bulb.

It features button-control at the top which include; An Ionizer, Timer, Power, 3-speed-fan-speeds, Filter-life-indicators & a Light-up Power Display.

Has a Smart Filter Light indicator that will let you when it’s time to replace the HEPA-Pure filter.

It’s very economical because it consumes less energy. In fact, it will use the same amount of power as a 50-Watt light-bulb.

It very affordable compared to other models with similar features. However, its price may vary depending on the store where you’re purchasing it from.

It’s ideal for asthmatic-people because it features a Pure True HEPA Filter that captures 99% of Allergens within your home.

The Pure True HEPA Filter should be replaced after 6-to-12 months of regular use so as to ensure optimum-performance.

Includes a locking control panel and child-safe vent guard which makes it safe for use in homes with kids or pets.

It features an Ozone Safe ionizer that produces negative ions in-order to clean air effectively without producing Ozone.

It features a portable tower-body featuring an LCD panel with intuitive controls coupled with a small-footprint, 2 unit-colors and 8 Designer-options available to complement your home-decor.

It features dimensions of; 22"H x 6"W x 10" coupled with a metallic tower-shaped body with a built-in handle that makes it easy to move around.

It weighs only 9-lbs and this makes it very lightweight and easy move from room-to-room. Additionally, it has a compact-size and small-footprint.