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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Systems HealthMate Air Purifier

Product ID: 540639933

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Details

Colour
Black/White
Brand
Austin Air
Product dimensions
48.3D x 68.6W
Power source
Corded
Item weight
45 Pounds

🏠Cleans up to 1500 sq ft

⚙️No assembly, plug & play

🛡️60 sq ft Medical-grade HEPA

Description

🌬️ Breathe Brilliance: Elevate Your Air, Elevate Your Life

EFFORTLESS SETUP - No assembly required—start breathing cleaner air right out of the box.
EXPANSIVE COVERAGE ZONE - Purifies large spaces up to 1500 sq ft—perfect for home or office.
ROBUST RELIABLE BUILD - Solid 20.41 kg design ensures durability and consistent performance.
MULTI CONTAMINANT DEFENSE - Eliminates dust, pollen, odors, chemical fumes, and more for a healthier environment.
MEDICAL GRADE HEPA POWERHOUSE - Captures 99.97% of airborne contaminants for pristine air quality.

The Austin Air Systems HealthMate Air Purifier features a certified 60 square foot Medical HEPA filter that removes 99.97% of airborne contaminants including dust, pollen, odors, and chemical fumes. Designed for large spaces up to 1500 square feet, it requires no assembly and weighs 20.41 kg, making it a durable, plug-and-play solution for cleaner, healthier indoor air.

Specifications

Product Dimensions	36.83 x 36.83 x 58.42 cm; 20.41 kg
Item volume	177046 Millilitres
Specification met	Certified HEPA
Is assembly required	No
Number of pieces	1
Batteries required	No

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