# Austin Air Allergy Machine Replacement Filter FR405B, White

**Replacement Filter for the Austin Air Allergy Machine with Pre-Filter**

The **Austin Air Allergy Machine** is designed specifically for people with asthma and allergies. Its unique design increases airflow, filtering allergens from the air immediately. Clinical trials have shown that using the Allergy Machine significantly reduces hospital visits for young asthmatic children.

All standard-size Austin Air units are interchangeable with standard-size filters. If you own a HealthMate and wish to upgrade to the Allergy Machine, simply purchase this replacement filter.

⚠ Before ordering, confirm the correct size and type to avoid restocking fees on incorrect returns. Check the label on the underside of your unit—Model HM400 indicates a standard-size filter.

**4-Stage Filtration Process:**

✅ Stage 1 – Large Particle Pre-Filter – Captures visible particles such as dust, hair, and pet dander.  
✅ Stage 2 – Medium Particle Pre-Filter – Traps smaller airborne particles like mold spores and pollen (color may vary: gray, blue, or green).  
✅ Stage 3 – Medical-Grade HEPA – 60 sq. ft. of True HEPA captures 99.97% of particles 0.3 microns and larger and 99% of particles 0.1 microns and larger, including allergens, bacteria, and viruses.  
✅ Stage 4 – Military-Grade HEGA Carbon Cloth – High Efficiency Gas Arrestance (HEGA) technology provides an extensive surface area for the adsorption of chemicals, gases, viruses, and bacteria.

**Product Features:**

-   Complete Replacement Pack – Includes all 4 filters to fully replace the original set.
-   Medical-Grade HEPA Filtration – 60 sq. ft. of True HEPA effectively removes 99.97% of allergens, bacteria, and viruses.
-   HEGA Carbon Cloth Technology – Military-grade HEGA filtration ensures superior gas, odor, and VOC adsorption.
-   Dual Pre-Filters – Trap large and medium-sized particles, extending HEPA filter life.
-   Compatible with Standard-Size Units – Designed for Austin Air Allergy Machine (HM405) and fits any standard-size Austin Air purifier.

[**Click here**](https://www.dropbox.com/scl/fi/y56368yk1kq3hq9yyiog2/AustinAirManual.pdf?rlkey=uibxrbchy6s256mzou4t6wyo7&e=1&dl=0 "Austin Air Manual") to view the Austin Air Owner's Manual.

**[](https://www.dropbox.com/scl/fi/y56368yk1kq3hq9yyiog2/AustinAirManual.pdf?rlkey=uibxrbchy6s256mzou4t6wyo7&e=1&dl=0 "Austin Air Manual")[Click here](https://austinair.com/how-do-i-change-the-austin-air-filter/ "Austin Air Manual")** for a one-page set of instructions on filter changes for the Austin Air.

## Details

- **Price:** 405.0 USD
- **Vendor:** AUSTIN AIR SYSTEMS
- **Type:** Air Purifier Replacement Filter
- **Tags:** AUSTIN AIR SYSTEMS, EA, OTC TAXABLE, SyncedWithC4

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 405.00 USD | In stock |

## Images

- Austin Air Allergy Machine Replacement Filter FR405B, White
- Austin Air Allergy Machine Replacement Filter FR405B, White

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> Source: [Village Green Apothecary](https://myvillagegreen.com/products/fr405b)
> Updated: 2026-06-06