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 B400B1 Standard Unit Healthmate Air Purifier, Bla

Product ID: 273788903

Details

Brand
Austin Air
Colour
Black
Control method
Touch
Item weight
20.41 kg
Power source
Corded

⚡Efficient 115W power usage

🌀4-stage multi-filter system

🏠Covers up to 1500 sq ft

Description

🌬️ Elevate your air game—because your home deserves the freshest vibe.

SPACIOUS COVERAGE - Purifies air efficiently across 1500 sq ft, perfect for modern open-plan homes.
QUIET YET POWERFUL - Operates at a subtle 62 decibels—clean air without the noise distraction.
TRUE MEDICAL GRADE HEPA - Captures 99.97% of particles as small as 0.3 microns for hospital-level air purity.
COMPREHENSIVE 4 STAGE FILTRATION - From visible dust to invisible gases, breathe cleaner with multi-layered defense.
MASSIVE ACTIVATED CARBON ZEOLITE CORE - Neutralizes odors and harmful chemicals, creating a fresher living space.

The Austin Air HealthMate B400B1 is a premium air purifier featuring a robust 4-stage filtration system including a True Medical Grade HEPA filter and over 780 cubic inches of activated carbon and zeolite. Designed to cover up to 1500 square feet, it effectively removes dust, pollen, mold, chemicals, gases, and odors. Operating quietly at 62 decibels with a 115-watt power draw, it’s engineered for professional-grade air quality in your home or office.

Specifications

ASIN	B0007Y830I
Brand Name	Austin Air
Color	Black
Contaminant Filtration Capability	Animal Dandruff, Cigarette smoke, Dust, Forest Fire Smoke, Pollen, Smells, Volatile Organic Compounds (VOCs)
Control Method	Touch
Controller Type	Touch Control
Customer Reviews	4.3 4.3 out of 5 stars (157)
Filter Type	HEPA
Floor Area	1500 Square Feet
Global Trade Identification Number	00769100216901
Item Weight	20.41 kg
Model Number	B400B1
Noise Level	62 Decibels
Number of Packs	1
Part Number	B400B1
Particle Retention Size	0.3 Micron
Power Source	Corded Electric
Software Update Supported to Date	unknown
Special Features	Air Purifier
Specification Met	Certified HEPA
UPC	720825438511 769100216901
Unit Count	1 Count
Wattage	115 watts

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