GermGuardian CDAP4500BCA VS. Germguardian AC4020

Features a True HEPA-Filter that eliminates 99.97% of allergens and other airborne-pollutants as small as 0.3-microns.

If you want this unit to run for a certain amount of time (from 1 to 8 hours), then you can set the timer. In fact, this unit will turn-off automatically after that time passes.

It uses an Activated-Charcoal-filter to trap and eliminate cigarette-odor and other household-odors from pets and cooking.

It’s ideal for use in small-to-medium sized rooms of up-to 153sq.ft. Likewise, this device can filter and circulate room-air for over 4X per-hour.

Uses UV-C light technology with Titanium-Dioxide to eliminate airborne germs, bacteria and viruses.

Its True HEPA filter can capture 99.97% of dust-mites while its Pre-filter helps to capture large dust-particles within air.

The True HEPA Filter can eliminate 99.97% of pet-dander and other airborne-pollutants down to 0.3-microns.

Uses a True HEPA Filter to trap and destroy 99.97% of pollen and other airborne-allergens down to 0.3-microns.

Uses an Activated-Charcoal-filter to eliminate cigarette and cooking smoke. This filter can also remove common household odors.

This device uses a HEPA-Filter and UV-C light technology with Titanium Dioxide to eliminate 99.97% of mold-spores.

This unit uses a True HEPA Filter to eliminate 99.97% of airborne-allergens and other particles as small as 0.3-microns.

It features 5 fan-speeds whereby the first 3-speeds are very quiet.

To change its filters, you have to take-off the back-panel by pushing on a clip near the top and then pull to reveal the filters.

It uses a SmartAQM (Air-Quality-Monitor) to detect to detect the amount of particles in air and then automatically adjusts fan-speed to optimize room-air-quality when set in auto-mode.

Features an ultra-quiet sleep mode that runs on lowest speed setting (speed-1). Additionally, when set on speed 2 or 3 it will emit a tiny white-noise that helps people fall asleep.

It uses 63-watts on the highest speed-setting and less than 10-watts at the lowest speed.

This device has an energy star rating for its low power-consumption even when running on the highest speed setting.

It features a digital control-panel at the top that features a different modes like; UV-mode, Speed-mode, Link-mode, Timer-mode & on/off-button.

It’s equipped with a filter replacement indicator that will alert you when it’s time to replace the filters. Likewise, the Guardian-App provides instant notifications and alerts you when it's time to replace the filter and UV-bulb.

This device is very economical because it consumes less power and even features a timer-option that avoids unnecessary electricity usage during the day.

It’s very affordable yet equipped with some of the best air-purification technologies coupled with Wi-Fi and Bluetooth connectivity.

It is a great device for allergy and asthma sufferers because it features a True HEPA filter that captures 99.97 of dust and allergens down to 0.3-microns in size.

This device is compatible with Alexa-skill in order to facilitate for remote voice-control while at home. Additionally, it’s also compatible with other SmartHome-services like Google-Assistant.

You can download the Guardian-App onto your Smartphone in-order to facilitate for wireless-control of this device from anywhere. In fact, you can connect to this device using Wi-Fi or Bluetooth technology.

Features a combined filter system that must be replaced every 6-to-8 months or depending on the usage of the product.

This device doesn't emit harmful-ozone because it converts it back to oxygen.

It has a slim, speaker-like tower design with a display-control-panel at the top, air-inlets at the back and air-outlets on the sides coupled with an AQM-LED-light at the front, a stand at the bottom and a carrying-handle.

Features a dimension of: 8.88"W x 6.38"D x 22"H coupled with a compact, black tower-shaped body made of durable ABS-plastic with a carrying-handle, AQM-LED-light, and a stand.

9.9-pounds and this makes it lightweight and easy to transport.