The C400 DLX upgrades the C400's carbon stage to enhanced impregnated activated carbon — chemically treated to extend effective adsorption to compounds that standard carbon cannot capture efficiently. This matters for MCS individuals and chemically reactive users whose reactivity triggers include ammonia, chlorine-based compounds, hydrogen sulfide, and certain industrial VOCs that standard carbon misses. The sealed all-metal housing and pressure-sealed filter chamber ensure all air passes through the full filter stack without bypass.
| Spec | Detail |
|---|---|
| MSRP | $709.98 |
| Series | 400 |
| Designed For | Airborne chemicals and VOCs — enhanced impregnated carbon |
| Carbon | Enhanced impregnated activated carbon |
| HEPA | True HEPA, 99.97% @ 0.3 microns |
| UV-C | No |
| Airflow | 360 CFM |
| Fan Speeds | 3 |
| Coverage | ~1,000 sq ft |
| Housing | All-metal, pressure-sealed |
| Ozone | None |
| Ionizer | None |
| Warranty | 5 yr parts / 10 yr labor |
Pre-Filter — Captures large particles at intake. Protects impregnated carbon and HEPA stages. Replace annually.
Carbon Bed — Enhanced Impregnated Activated Carbon — Chemically treated carbon that extends adsorption range beyond standard activated carbon. Targets: ammonia and nitrogen compounds, chlorine-based compounds, hydrogen sulfide, formaldehyde at low concentrations, industrial VOCs and solvents, acids and acid gases, plus the full range of VOCs addressable by standard carbon. Over 400 specialty blends available for specific chemical environments.
True HEPA — 99.97% @ 0.3 microns — Removes fine particulate, mold spores, pollen, pet dander, bacteria, and airborne viral particles.
No pre-packaged replacement bundles for the 400 series. Replacement filters sold individually — contact Fresh Home Air for current filter pricing.
| Filter | Suggested Interval |
|---|---|
| Pre-Filter | Every 12 months |
| Carbon Filter | Every 2 years |
| HEPA Filter | Every 3–5 years |
| Zone | States | Rate |
|---|---|---|
| Zone 1 | ME, NH, VT, MA, NY, CT, RI, NJ | $51.95 |
| Zone 2 | MD, DE, WV, VA, OH, MI, DC, PA | $55.41 |
| Zone 3 | WI, IL, IN, KY, TN, NC, SC, GA | $60.16 |
| Zone 4 | FL, AL, ND, SD, MN, NE, IA, KS, MO, AR, LA, MS | $67.13 |
| Zone 5 | MT, WY, CO, TX | $73.77 |
| Zone 6 | WA, OR, CA, NV, ID, UT, AZ, NM | $78.72 |
Contact Fresh Home Air for 400 series chemical model filter shipping rates.
C400 DLX vs. C400: The C400 uses standard activated carbon. The C400 DLX upgrades to enhanced impregnated carbon — the correct choice when ammonia, chlorine, or impregnation-dependent chemical targets are present. C400 DLX vs. C600 DLX: The C600 DLX carries 26 lbs of enhanced impregnated carbon at 560 CFM for serious MCS environments in larger rooms. The C400 DLX is correctly sized for a single room.
*Manufactured in Montreal, Canada.*
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HEPA and activated carbon filters trusted by MCS patients, allergy sufferers, and healthcare professionals.
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Every purifier we carry uses HEPA and carbon filtration only. Safe for the most chemically sensitive. No ionizers, no UV, no ozone.
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Comparison reflects Austin Air and Airpura products sold on freshhomeair.com vs. common consumer-grade air purifiers.
Everything you need to know before you buy.
Coverage varies by model — check the product specifications above for the rated room size. As a general rule, all units perform best when running below their rated capacity, which reduces noise and extends filter life.
Airpura filter life varies by model and usage. The carbon bed in this unit is rated to last 2–3 years under continuous use in a typical residential environment. HEPA and pre-filters have their own replacement schedules. Replacement filters are available on our filters page. Running the unit below its rated capacity meaningfully extends filter life.
Austin Air units have 4 speed settings. Speed 1 is quiet enough for sleeping. Speed 2 produces a consistent low hum that most people find unobtrusive. Speed 3 is suitable for daytime use. Speed 4 is intended for rapid air changes in emergency situations — wildfire smoke events, high-pollen days — not for standard overnight operation.
No. This unit uses only mechanical filtration — no ionizer, no UV, no ozone generator. It is safe for people with asthma, chemical sensitivity, and other respiratory conditions where ozone is a known irritant. This is a firm design standard across the entire Austin Air lineup.
Yes. Austin Air and Airpura units are used by patients with asthma, allergies, and chemical sensitivity. The True HEPA captures particle-class triggers and the activated carbon addresses VOCs, odors, and chemical compounds. No ionizer, no ozone — safe for respiratory conditions. For MCS specifically, the HealthMate Plus or Airpura C600 have the most relevant specifications.
Yes. Airpura units are designed for continuous residential operation. The steel-body construction and quality motor components are built for this use case. Most Airpura users run their units continuously at speed 2–3. Continuous operation at a moderate speed outperforms intermittent high-speed runs for maintaining consistent indoor air quality.
Airpura units ship directly from their facility in Montreal, Canada. Orders typically clear customs within 2–3 business days and arrive within 7–14 business days to most US addresses. You will receive a tracking number once your order ships. Import duties and customs fees are included in the product price — no surprise charges at delivery.
Airpura units carry a 5-year warranty on parts and labor. As an authorized Airpura dealer, Fresh Home Air supports the full manufacturer warranty. Contact us at support@freshhomeair.com for warranty service.
We accept returns within 30 days of delivery for units in original condition. Contact us at support@freshhomeair.com to initiate a return. Return shipping is the responsibility of the customer unless the unit arrives damaged or defective. Units that arrive damaged should be reported within 48 hours of delivery with photos.
Yes. No ionizer, no ozone, no UV exposure to room air. The Austin Air HealthMate was specifically studied at Johns Hopkins for use in children's homes — the clinical research involved families with young children. These units are safe for continuous operation in homes with children and pets. They are in fact commonly deployed exactly for this purpose.
Authorized Airpura & Austin Air Dealer · HEPA + Carbon Filtration Only · No Ionizers · No UV · No Ozone · 10% off First Order · Trusted by MCS Patients · Over 60 Air Purifiers In Stock
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