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, 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

⏳5-year filter lifespan

🏠Covers up to 1,500 sq ft

🛡️4-stage filtration power

R51500

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Description

🌬️ Elevate your air quality game — because your lungs deserve the best!

LOW EMF EMISSION - Health-conscious design minimizes electromagnetic exposure.
EXPANSIVE COVERAGE - Purifies large living or office spaces up to 1,500 sq ft effortlessly.
QUIET YET POWERFUL - Runs efficiently with minimal noise, perfect for bedrooms and workspaces.
LONG LASTING FILTERS - Up to 5 years of maintenance-free, cost-effective air purification.
COMPREHENSIVE 4 STAGE FILTRATION - From dust to VOCs, breathe only the cleanest air.

The Austin Air HealthMate Standard (Model B400) is a robust air purifier featuring a 4-stage filtration system including True Medical Grade HEPA, Activated Carbon, and Zeolite to remove 99.97% of particles and neutralize odors, smoke, and VOCs. Designed for spaces up to 1,500 sq ft, it operates quietly with low EMF emissions and offers an impressive 5-year filter life, making it a premium, low-maintenance solution for allergy, asthma, and pet sensitivity sufferers seeking cleaner, healthier indoor air.

Specifications

ASIN	B0007Y830I
ASIN	B0007Y830I
Best Sellers Rank	#439,240 in Home & Kitchen ( See Top 100 in Home & Kitchen ) #466 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 (239)
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 Highlight	4 Stage Filtration, Activated Carbon And Zeolite, Covers Up To 1,500 sq ft, Quiet, 5 Year Filter Life
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
Software Update Supported to Date	unknown
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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TrustScore 4.5 | 7,300+ reviews

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Received my product in pristine condition. Great service overall.

1 month ago

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

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R51500

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered 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 South Africa.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Abdullah B.

Great price for an authentic product. Fast international shipping too!

3 weeks ago

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Best international shipping I've ever tried. Worth every penny!

3 days ago

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