Austin Air Bedroom Machine HM402 Air Purifier
The Austin Air Bedroom Machine HM402 Air Purifier is Austin Air's most comprehensive filtration system, designed to create a cleaner and more comfortable sleeping environment.
Its five-stage filtration system helps remove airborne viruses, bacteria, allergens, chemicals, volatile organic compounds, gases, odors, dust, pollen, pet dander, and other indoor pollutants that may interfere with sleep and respiratory comfort.
The Bedroom Machine is ideal for people who experience poor-quality sleep, nighttime allergy or asthma symptoms, COPD-related concerns, dry throat, stuffy nose, or irritation caused by contaminated indoor air. It is recommended for spaces between 1,000 and 1,500 square feet.
Under normal residential use, the filtration system is designed to last up to five years. Routine maintenance is minimal and generally requires vacuuming the exterior of the unit approximately once per month.
Will ship in 2–4 business days.
Austin Air Bedroom Machine HM402 Air Purifier Features
- Recommended coverage: Ideal for indoor areas between 1,000 and 1,500 square feet.
- Sleep-focused design: Developed to improve bedroom air quality and support a cleaner, more comfortable sleeping environment.
- Five-stage filtration: Combines two particle pre-filters, activated carbon, zeolite, True Medical Grade HEPA, and Military-Grade HEGA carbon cloth.
- Comprehensive contaminant removal: Helps filter airborne viruses, bacteria, allergens, chemicals, gases, odors, and volatile organic compounds.
- Nighttime allergen reduction: Helps remove dust, pollen, mold spores, pet dander, and other irritants that may contribute to nighttime allergy or asthma symptoms.
- Gas and odor filtration: Activated carbon, zeolite, and HEGA carbon cloth help adsorb chemicals, gases, and odors.
- Long filter life: The filtration system is designed to last up to five years under normal residential use.
- Minimal maintenance: Routine care generally involves vacuuming the exterior of the purifier once per month.
- Three fan speeds: Allows the airflow level to be adjusted according to room conditions and personal preference.
- Continuous operation: The high-efficiency motor is designed for continuous use at high RPM.
- 360-degree air intake: The perforated steel housing draws contaminated air into the purifier from all sides.
- Durable exterior: Features a baked-on powder coat finish designed to prevent paint-related off-gassing.
- Made in the USA: All units are assembled in the United States, and approximately 95% of the components are made in the USA.
- Safety certification: CSA/NRTL approved and independently tested to meet recognized safety and performance standards.
Austin Air Bedroom Machine HM402 Five-Stage Filtration System
- Stage 1: A bonded polyester large-particle pre-filter helps capture visible contaminants such as dust, hair, and pet dander.
- Stage 2: A bonded polyester medium-particle pre-filter helps remove small to medium-sized particles, including mold spores and pollen.
- Stage 3: More than 780 cubic inches of activated carbon and zeolite help adsorb chemicals, gases, volatile organic compounds, and odors.
- Stage 4: Sixty square feet of True Medical Grade HEPA material removes 99.97% of particles larger than 0.3 microns and 95% of particles larger than 0.1 microns.
- Stage 5: Military-Grade HEGA carbon cloth provides an additional layer of protection against chemicals, gases, viruses, and bacteria.
The five-stage filtration system provides broad protection against both airborne particles and gaseous contaminants, making the Bedroom Machine suitable for bedrooms and other indoor spaces requiring advanced filtration.

Austin Air Bedroom Machine HM402 Sleep and Air Quality Benefits

- Cleaner sleeping environment: Helps remove airborne contaminants that may interfere with comfort and sleep quality.
- Nighttime allergen reduction: Helps capture allergens that may contribute to nighttime allergy and asthma symptoms.
- Respiratory comfort: Cleaner bedroom air may help reduce irritation associated with coughing, wheezing, sneezing, dry throat, and a stuffy nose.
- Snoring-related irritants: Helps remove airborne irritants that may contribute to nighttime breathing discomfort and snoring.
- Airborne virus reduction: Helps reduce the concentration of airborne viruses and other particles in the surrounding environment.
- Odor and gas removal: Helps filter gases, odors, volatile organic compounds, and chemicals from bedroom air.
- Daily well-being: Better-quality sleep may support improved energy, concentration, and productivity throughout the day.
Austin Air Bedroom Machine HM402 Clinical Study Information
- Nitrogen dioxide study: In a Johns Hopkins University clinical trial, the Austin Air Bedroom Machine was used in Baltimore homes to reduce nitrogen dioxide associated with gas stove use. Reported results showed a 27% reduction in kitchen nitrogen dioxide levels and a 23% reduction in bedroom levels within one week. Read the nitrogen dioxide study.
- Secondhand smoke study: A second Johns Hopkins study placed Bedroom Machine units in the homes of women who were pregnant or caring for young babies while living with a smoker. The study reported that the purifier effectively removed indoor pollutants, including nicotine. Read the secondhand smoke study.
Austin Air Bedroom Machine HM402 Air Purifier Specifications
- Model: HM402
- Recommended room size: Approximately 1,000 to 1,500 square feet
- Dimensions: 23 inches high x 14.5 inches wide x 14.5 inches deep
- Weight: 47 lbs.
- Air intake: 360-degree perforated steel intake housing
- Exterior finish: Baked-on powder coat paint
- Fan type: Three-speed centrifugal fan
- Motor: High-efficiency motor rated for continuous use at high RPM
- Power requirements: 1.2 amps, 120V, and 147 watts on the high setting
- Rated fan airflow: 75 CFM on the lowest setting to 400 CFM on the highest setting
- Noise level: Approximately 50 dB to 62 dB
- Particle filtration: Removes 99.97% of particles larger than 0.3 microns and 95% of particles larger than 0.1 microns
- HEPA surface area: 60 square feet of True Medical Grade HEPA material
- Carbon and zeolite capacity: More than 780 cubic inches
- Additional filtration: Military-Grade HEGA carbon cloth
- Filter life: Up to five years under normal residential use
- Country of assembly: Assembled in the USA
- Domestic components: Approximately 95% of components are made in the USA
- Certification: CSA/NRTL approved
- Estimated shipping time: Two to four business days

Austin Air Bedroom Machine HM402 Warranty Information
- Mechanical warranty: Five-year warranty against defects in materials and workmanship from the date of purchase, provided the purifier is operated under normal residential use and the warranty registration is completed and returned to Austin Air Systems.
- Filter warranty: Five-year prorated filter warranty for filters used under normal residential conditions.
Austin Air Bedroom Machine HM402 Downloads
- Owner's manual: Download the Austin Air Bedroom Machine Owner's Manual
- Technical specifications: Download the Austin Air Bedroom Machine Technical Specifications
Create a cleaner and more comfortable sleeping environment with the advanced five-stage filtration of the Austin Air Bedroom Machine HM402.
Order the Austin Air Bedroom Machine HM402 today and enjoy fresher bedroom air, quieter nights, and more restorative sleep.
Order Processing: Once you place your order, you'll receive an order confirmation email. Please allow 1-3 business days for processing. If there are any unexpected delays, we’ll reach out to you immediately.
Shipping Methods:
- Standard Shipping: Small items ship with UPS, FedEx, or USPS. They usually do not need a delivery signature.
- Freight Shipping: Large or heavy items ship with a box truck to your curbside or loading dock. They will schedule a delivery appointment when the shipment is in your area.
Delivery Timeline:
- Processing: Please allow 1-3 business days for us to process your order in our system.
- Handling Time: This product should ship out in days from the time it is processed.
- Transit Time: Ground orders take 1-5 business days. Freight shipments may take 3-10 business days, depending on your location.
- Delivery Appointment: For freight deliveries, the carrier will contact you to set a delivery time. Someone must be present to receive the delivery.
Receiving Your Shipment: Inspect your shipment for damage before signing the delivery receipt. For any issues, mark “DAMAGED, NEEDS REVIEW,” take photos, and contact us within 2-3 business days.
Warranty Information:
We’re an authorized dealer; all products include the original manufacturer’s warranty. See product details for coverage specifics.
Questions or a claim? Contact us or the manufacturer for assistance.
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