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

Austin Air B400B1 Standard Unit Healthmate Air Purifier, Bla

Product ID: 273788903

Details

Brand
Austin Air
Control method
Touch
Filter type
HEPA
Item weight
45 Pounds
Power source
Corded

⚡115W energy-efficient motor

🌬️99.97% HEPA particle removal

🛡️4-stage filtration power

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¥597797

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Description

🌿 Elevate your air game—because your workspace deserves nothing less!

QUIET POWER MODE - Low setting offers whisper-quiet operation perfect for focused work or restful sleep.
QUAD STAGE DEFENSE - Four advanced filters trap dust, pollen, chemicals & odors for pristine air.
ODOR VOC VANQUISHER - 780+ cubic inches of activated carbon and zeolite neutralize smoke and harmful gases.
BUILT TO LAST IMPRESS - Robust 20kg steel frame designed for durability and a sleek professional aesthetic.
MEDICAL GRADE HEPA PRECISION - Captures 99.97% of particles as small as 0.3 microns—breathe with confidence.

The Austin Air B400B1 HealthMate is a heavyweight air purifier featuring a comprehensive 4-stage filtration system including a true medical-grade HEPA filter and over 780 cubic inches of activated carbon and zeolite. Designed for spaces up to 750-800 sq ft, it effectively removes dust, allergens, VOCs, smoke, and odors with 99.97% efficiency on particles ≥0.3 microns. Operating at 115 watts and 62 decibels on high, it balances powerful purification with manageable noise levels. Its durable steel construction and proven long-term performance make it a trusted choice for professionals seeking cleaner, healthier indoor air.

Specifications

ASIN	B0007Y830I
Brand Name	Austin Air
Control Method	Touch
Controller Type	Touch Control
Customer Reviews	4.4 4.4 out of 5 stars (157)
Filter Type	HEPA
Floor Area	1500 Square Feet
Global Trade Identification Number	00769100216901
Item Weight	45 Pounds
Manufacturer	Austin Air
Model Number	B400B1
Noise Level	62 Decibels
Part Number	B400B1
Particle Retention Size	0.3 Micron
Power Source	Corded Electric
Special Features	Air Purifier
Specification Met	Certified HEPA
UPC	720825438511 769100216901
Unit Count	1 Count
Wattage	115 watts

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How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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¥597797

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Japan.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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