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Review of the Dreo Macro Max S Air Purifier

Walter Shillington writes about products he knows firsthand. His articles focus on healthcare, electronics, watches, and household items.

The Dreo Macro Max S Air Purifier

The Dreo Macro Max S Air Purifier

Many manufacturers now equip their air purifiers with sensors that actively search for contaminants in the surrounding air. These sensors are useful because, in auto mode, they act as a trigger, forcing the device's fan to increase in speed. Then, as the number of these nasty particles is reduced, the air purifier's fan rotation rate will decrease. Effective sensors contribute to a more efficient cleaning process and an overall reduction of noise levels.

Size is another factor that should be considered when purchasing an air purifier. Small units are best suited for bedrooms. Larger rooms require an air purifier that quickly processes substantial quantities of air. In today's review, I am examining an air purifier capable of handling the 500-square-foot area occupied by my dining and living rooms.



The Dreo Macro Max S is sheathed in silvery-gray plastic and weighs 11.6 pounds. It is 21 inches high, 11 inches wide, and 11 inches deep.

A brushless DC motor powers a fan that draws air through a myriad of perforations piercing the back and sides of this unit. The air then passes through a sizeable conical filtration unit consisting of a prefilter, HEPA 13 filter, and activated carbon layer. The resulting clean air exits through the top of the air purifier.

The circular control panel and display at the top of this device allow the user to set a timer and control power, fan speed, and mode.

A tubular extension of the control panel continues downward to the base of the air purifier. This provides air quality information and a flame-like representation of the cleanliness of the surrounding air.

The back of this unit is fitted with a PM2.5 sensor. This sensor provides data pertaining to air quality and, when the device is set to auto, is used to control the air purifier's fan speed.

Both Apple and Android versions of the Dreo application are available. This application is valuable because it allows greater control of the Macro Max S.

Clean air outputs from the top.  Note the control panel and air quality indication

Clean air outputs from the top. Note the control panel and air quality indication


  • Brand: Dreo
  • Name: Macro Max S
  • Model: DR-HAP003
  • Net weight: 5.27 kilograms (11.62 pounds)
  • Dimensions: 28 x 28 x 53 centimeters (11 x 11 x 21 inches)
  • Power input: 120V- 60Hz 1.0A
  • Rated power: 53W
  • Noise level: 20-62.2dB
  • Modes: Automatic, sleep, turbo, and manual (variable speeds)
  • CADR: 273CFM/464CMH (Clean air delivery rate)
  • ACPH: 4.8(423ft²)/2(1016ft²) (Air changes per hour)
  • Filter type: Conical H13 True HEPA with prefilter and an activated carbon layer
  • Sensor type: PM2.5
  • Application: DREO
  • Voice control: Alexa and Google Assistant

The Filter

The Dreo Macro Max S Air Purifier is fitted with a conical-shaped filtration device composed of a prefilter, an H13 HEPA filter, and a layer of activated carbon. It is designed for medium to large rooms and can trap 99.985% of airborne particles down to 0.3μm, including allergens, pet dander, pollen, and VOCs. This filter is certified by SGS to filter certain bacteria.

The air filter

The air filter


Clean Air Delivery Rate

CADR is a metric indicating the amount of air cleaned of particles sized 0.3 microns or larger within a specific period of time. The CADR of the Macro Max S can be expressed as 273 cubic feet per minute or 464 cubic meters per hour. This air purifier is capable of processing the air of a 500-square-foot area four times within one hour.


This web-like filter wraps around the HEPA filter, trapping larger particles.

Activated Carbon Filter

This layer of the primary filter removes volatile organic compounds and other odors.

Total Volatile Organic Compounds

The term TVOC denotes the amount of organic chemicals present. These chemicals are emitted as gas from the products used to build and maintain our homes. While the Macro Max S is not fitted with a gas sensor designed to detect these compounds, its activated carbon filter will remove them.

Primary filter

This tri-filter consists of a prefilter, an H13 HEPA filter, and an activated carbon layer. It is conical in shape, nine inches in diameter, and one foot tall.

During a child safety-related test, I pulled the magnetic filter cover from the back of the air purifier. The device immediately shut down. Once I replaced the cover, the air purifier resumed operation in the previously selected mode.

Top view

Top view

Closeup of control panel

Closeup of control panel

PM 2.5 Sensor

The air purifier's sensor monitors and detects particles that are 2.5 micrometers in diameter or smaller.

Setting up the Dreo Macro Max S

I turned the unit on and watched as its display lit, noting that the air quality was a perfect 100 percent. An attractive flame-like indicator confirmed this notification.

My next step was to download and install the DREO application. The Macro Max S was quickly recognized and easily linked to Amazon Alexa when I added my new air purifier to the application.

I found the DREO application to be quite helpful. Although you can manually select one of four fan speeds by pressing the appropriate button on the air purifier, the application provides a choice of 18 different rotation rates.

View of the bottom and inside of the air purifier

View of the bottom and inside of the air purifier

Closeup view of the fan unit

Closeup view of the fan unit

Test Procedure

The dining and living rooms occupy the center of my house. When located in this area and at maximum speed, the new air purifier effectively circulates and cleans the air within both these rooms. It also handles the air within my office and kitchen, albeit more slowly and less efficiently.

I set the DREO air purifier to automatic and smoked cigarettes in my office, kitchen, and living room. On each occasion, the air purifier's sensor picked up the smoke before I half-finished the cigarette and increased the fan's speed.

While this test confirms the high sensitivity and effectiveness of the air purifier's sensor, I should also note that, like every air purifier I've reviewed, it is quite noisy at its highest setting. Happily, this unit's fan speed will decrease with the diminishing level of contamination.

The orange glow indicates moderate air quality

The orange glow indicates moderate air quality

The red glow indicates poor air quality.  Blue represents excellent and green indicates good-quality air

The red glow indicates poor air quality. Blue represents excellent and green indicates good-quality air

Overall Impression

This is a well-designed air purifier fitted with a variety of features that increase efficiency and convenience. It is equipped with one of the most responsive PM 2.5 sensors I have tested, and while it lacks a gas sensor, this device can effectively trap volatile organic compounds.

The accompanying application is extremely useful. If you decide to operate this air purifier in manual mode, the choice of 18 different fan speeds will ensure you can perfectly balance noise levels and clean air delivery rate. The Dreo Macro Max S Air Purifier is recommended.

This content is accurate and true to the best of the author’s knowledge and is not meant to substitute for formal and individualized advice from a qualified professional.

© 2022 Walter Shillington