The G400 DLX is the highest-specification chemical filtration model in the 400 G series — German-sourced activated carbon from Blücher Technologies upgraded to the enhanced impregnated formulation. Impregnated treatment extends effective adsorption to reactive compounds that standard carbon — including standard German carbon — cannot capture efficiently: ammonia, chlorine-based compounds, hydrogen sulfide, and acid gases. For individuals with severe MCS whose reactivity triggers span both the standard VOC range and reactive chemical compounds, and for whom the carbon source matters as much as the chemical treatment, the G400 DLX provides the fullest chemical capture profile available in the compact 400 platform.
| Spec | Detail |
|---|---|
| MSRP | $749.98 |
| Series | 400 |
| Designed For | Severe MCS — enhanced impregnated German-sourced carbon for expanded chemical capture |
| Carbon | Enhanced impregnated German-sourced activated carbon (Blücher Technologies) |
| 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 German-Sourced Activated Carbon — Blücher Technologies spherical carbon with chemical impregnation treatment. Combines the purer manufacturing profile of German-sourced carbon with the expanded adsorption range of impregnated treatment. Captures the full standard VOC range plus ammonia and nitrogen compounds, chlorine-based compounds, hydrogen sulfide, formaldehyde at low concentrations, industrial VOCs and solvents, and acid gases. Specified for severe MCS individuals with wide-spectrum chemical reactivity.
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.
G400 DLX vs. G400: The G400 uses standard German-sourced carbon. The G400 DLX adds enhanced impregnated treatment — the correct choice when ammonia, chlorine, or reactive compounds are reactivity triggers. G400 DLX vs. C400 DLX: Both use enhanced impregnated carbon. The G400 DLX uses German-sourced carbon — appropriate when the manufacturing origin of the carbon is itself a reactivity consideration. G400 DLX vs. G600 DLX: The G600 DLX carries enhanced impregnated German carbon at 560 CFM for 2,000 sq ft. The G400 DLX is correctly sized for a single room.
*Manufactured in Montreal, Canada.*
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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.
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