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 best!

SILENT GUARDIAN - Operates quietly at 62 decibels, ensuring peaceful environments without sacrificing performance.
LONG TERM FRESHNESS - Up to 5 years of filter life means less hassle, lower maintenance costs, and continuous clean air.
WHOLE ROOM WELLNESS - Covers up to 700 sq ft, perfect for open-concept homes and office spaces to keep everyone refreshed.
HEALTH CONSCIOUS DESIGN - Low EMF emissions and activated carbon + zeolite combo neutralize odors, smoke, and harmful VOCs.
BREATHE PURE LIVE BETTER - Advanced 4-stage filtration captures 99.97% of particles down to 0.3 microns for truly clean air.

The Austin Air HealthMate B400 is a robust, 4-stage air purifier designed for large spaces up to 700 sq ft. Featuring True Medical Grade HEPA filtration combined with activated carbon and zeolite, it removes dust, allergens, odors, smoke, and VOCs while operating quietly at 62 dB. With a long-lasting filter life of up to 5 years and low EMF emissions, it’s engineered for health-conscious professionals seeking cleaner, fresher air in their homes or offices.

Specifications

ASIN	B0007Y830I
ASIN	B0007Y830I
Best Sellers Rank	#575,568 in Home & Kitchen ( See Top 100 in Home & Kitchen ) #1,047 in HEPA Filter Air Purifiers
Brand Name	Austin Air
Color	Black
Contaminant Filtration Capability	True
Control Method	Touch
Controller Type	Button Control
Customer Reviews	4.3 4.3 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
Is Discontinued By Manufacturer	No
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 Decibels
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	1.0 Count
Warranty Description	5 year parts and labor
Wattage	115 watts

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$2657.08

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

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TrustScore 4.5 | 7,300+ reviews

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