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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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

⚡Efficient 115W power usage

🌀4-stage multi-filter system

🏠Covers up to 1500 sq ft

$3869.48

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Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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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
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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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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TrustScore 4.5 | 7,300+ reviews

Yusuf A.

Fantastic experience overall. Will recommend to friends and family.

1 month ago

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The product exactly matches the description. Very satisfied with my purchase.

5 days ago

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$3869.48

Duties & taxes included

In stock

Sold byAmazon USADelivered 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 USA.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

Ali H.

Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

1 day ago

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