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 Standard Air Purifier, Black - Advanced 4- Stage Filtration Air Purifiers For Home with Activated Carbon & Zeolite, Model B400

Austin Air HealthMate Standard Air Purifier, Black - Advanced 4- Stage Filtration Air Purifiers For Home with Activated Carbon & Zeolite, Model B400

Product ID: 10041110

Details

Brand
Austin Air
Color
Black
Item Weight
45 pounds
Power Source
AC
Product Dimensions
19"D x 27"W x

🏠700 sq ft coverage

🔇quiet 62 dB operation

🛡️4-stage filtration power

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Description

🌬️ Elevate your air game — because your lungs deserve the VIP treatment!

LONG TERM FRESHNESS - Up to 5 years of filter life means less hassle and more consistent clean air without frequent replacements.
WHOLE ROOM WELLNESS - Covers up to 700 sq ft, perfect for open-concept homes and office spaces to ensure fresh air everywhere.
WHISPER QUIET COMFORT - Operates at a low 62 dB noise level, blending seamlessly into bedrooms and workspaces without disruption.
HEALTH CONSCIOUS DESIGN - Low EMF emissions protect sensitive users while neutralizing odors, smoke, and harmful gases naturally.
BREATHE PURE LIVE BETTER - Advanced 4-stage filtration captures 99.97% of particles down to 0.3 microns, including dust, pollen, and VOCs.

The Austin Air HealthMate B400 is a robust, 4-stage air purifier featuring True Medical Grade HEPA, Activated Carbon, and Zeolite filters. It effectively removes airborne particles, allergens, odors, and VOCs across spaces up to 700 sq ft. Designed for quiet operation and long-lasting performance, it supports healthier living environments with minimal maintenance and low EMF emissions.

Specifications

ASIN	B0007Y830I
ASIN	B0007Y830I
Best Sellers Rank	#836,318 in Home & Kitchen ( See Top 100 in Home & Kitchen ) #769 in HEPA Filter Air Purifiers
Brand Name	Austin Air
Color	Black
Contaminant Filtration Capability	True
Control Method	Touch
Controller Type	Button Control
Customer Reviews	4.4 4.4 out of 5 stars (237)
Date First Available	September 16, 2003
Department	All Ages
EU Spare Part Availability Duration	5 years
Filter Class	HEPAFilterClass
Filter Type	HEPA
Floor Area	1500 square_feet
Global Trade Identification Number	00769100216901
Included Components	Air Purifier
Item Dimensions D x W x H	19"D x 27"W x 19"H
Item Type Name	B400B1
Item Weight	45 pounds
Item model number	B400B1
Manufacturer	Austin Air
Manufacturer	Austin Air
Model Number	B400B1
Noise Level	62 db
Part Number	B400B1
Power Source	AC
Product Dimensions	14.5 x 14.5 x 23 inches; 45 pounds
Specification Met	CSA Certified
UPC	720825438511 769100216901
Unit Count	1 Count
Warranty Description	5 year parts and labor
Wattage	115 watts

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2126744CFA

Duties & taxes included

In stock

Sold byAmazon SenegalDelivered 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 Senegal.

Secure transaction

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