what is the difference between the B400 and the HM400 units?

no difference, they are the same thing. Austin Air uses both for the same unit.

Mine seems to thrum unevenly, as if the motor is off balance. Is that normal?

Mine does this occasionally, especially after switching from a higher fan speed to a lower one. It usually normalizes within a few minutes though.

how many square feet does it cover?

1500 sq ft on high. This should used more for comparison levels because most of the time you should run the unit on low or medium. Normally we recommend to our clients to run on high for a few hours when they first get it and then low to medium. If something happens to give a high contaminant in the area, then raise to high temporarily to alleviate the situation. We also recommend to over not run right up to your room size limits. More air changes are better than fewer. Lastly, keep in mind that walls, doors, furniture obstruct airflow too. — Thank you, Barb Lulay at USAirPurifiers.com

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Austin Air HealthMate Plus Air Purifier HM450-Midnight Blue

Austin Air HealthMate Plus Air Purifier HM450-Midnight Blue

Product ID: 540639933

Details

Brand
Austin Air
Colour
Midnight Blue
Control method
App
Item weight
47 Pounds
Power source
ac

🌿Granular carbon & zeolite for VOC removal

🏠Cleans up to 1500 sq ft

🛡️Medical-grade HEPA filter

Description

🌬️ Breathe Boldly: The No-Nonsense Air Guardian for Your Space

MOBILITY MEETS DURABILITY - Heavy-duty metal housing with smooth-rolling wheels lets you move powerful clean air wherever you need it most.
ADVANCED VOC ODOR DEFENSE - Packed with pounds of granular carbon and zeolite to neutralize harmful chemical fumes and stubborn odors.
WHOLE ROOM PURIFICATION POWER - Effortlessly cleans air in spaces up to 1500 sq ft—perfect for home or office.
HOSPITAL GRADE HEPA FILTRATION - Captures 99.97% of particles down to 0.3 microns, shielding you from dust, pollen, and allergens.
BUILT FOR REAL WORLD CHALLENGES - Designed to tackle secondhand smoke, wildfire haze, and industrial pollutants without gimmicks or smart tech distractions.

The Austin Air Systems HealthMate Air Purifier is a robust, medical-grade air filtration system designed to purify large spaces up to 1500 sq ft. Featuring a certified HEPA filter combined with substantial granular carbon and zeolite layers, it effectively removes airborne particles, allergens, chemical fumes, and odors—including challenging VOCs like smoke and paint fumes. Its durable metal build and wheeled base offer easy mobility, making it ideal for allergy sufferers and those sensitive to indoor pollutants seeking uncompromising air quality without smart tech distractions.

Specifications

ASIN	B006G17P50
Best Sellers Rank	2,182,020 in Home & Kitchen ( See Top 100 in Home & Kitchen ) 1,835 in Air Purifiers
Brand Name	Austin Air
Colour	Midnight Blue
Control Method	App
Controller Type	mobile app
Customer Reviews	4.4 4.4 out of 5 stars (179)
Filter Type	HEPA
Floor Area	700 Square Feet
Global Trade Identification Number	00769100217090
Item Weight	47 Pounds
Manufacturer	Austin Air
Model Number	B450E1
Part Number	B450-MidnightBlue
Power Source	ac
Specification Met	[Unknown]
UPC	769100216963 769100217090
Unit Count	1 Air Purifier

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