React G3 X Auto-CPAP Machine Package with Heated Humidifier
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The React Health G3 X Auto CPAP (Model G4600) is the first standard-size CPAP machine available in the US engineered completely without polyurethane foam — removing the foam degradation and off-gassing concerns that have driven significant industry attention and machine recalls since 2021. A unique honeycomb sound-dampening design maintains 28 dB quiet operation without foam. Smart A™ adaptive pressure technology fine-tunes the auto-adjusting algorithm over a rolling 5-session window to personalize therapy to your actual breathing patterns. Integrated heated humidifier, 6-foot heated tubing, RESlex exhalation relief, AutoRamp, audible leak detection, and full event monitoring including central apneas and Cheyne-Stokes respiration. 4G cellular modem with React Health Connect cloud platform. iCodeQR compliance data. 5-year warranty — longest in the industry. HCPCS E0601. Prescription required.
What Defines This Machine
Full Specifications
| Model Number | G4600 (with cellular modem and heated tubing) |
| Manufacturer | React Health |
| Therapy Modes | Auto CPAP (APAP) and Fixed CPAP — user switchable |
| Pressure Range | 4 – 20 cmH₂O — adjustable in 0.5 cmH₂O increments |
| Foam Construction | Foam-free — first standard-size foam-free PAP in the US; honeycomb sound-dampening design |
| Noise Level | 28 dB(A) at 10 cmH₂O working pressure (ISO 4871:1996); higher pressures produce more noise |
| Adaptive Algorithm | Smart A™ — reviews rolling 5 successful sessions; adjusts Auto Min and Auto Max based on 50th and 95th percentile pressure data |
| Humidifier | Built-in heated humidifier — 360 mL push-down water chamber; pre-heat mode; 5 fixed levels + Auto mode |
| Tubing Included | 6-foot heated tubing — prevents rainout; maintains temperature and humidity consistency |
| Exhalation Relief | RESlex™ — off / 1 / 2 / 3 settings |
| Ramp Feature | AutoRamp (sleep detection) or manual 0–60 minutes |
| Auto On | Yes — starts therapy when you breathe into mask |
| Leak Detection | Audible alert + on-screen "Leak!!" message after 40-second sustained leak |
| Event Monitoring | Obstructive apneas, hypopneas, snoring, central apneas, Cheyne-Stokes respiration, mask leaks |
| Session Feedback | Usage Summary and Usage Score displayed on screen after each session |
| Supply Reminders | Automatic on-screen reminders for filter and supply replacement |
| Connectivity | 4G cellular modem (no Wi-Fi required) — React Health Connect cloud platform |
| Data Access | iCodeQR on-screen code (scan with phone); SD card; React Health Plus app; React Health Connect web portal |
| Provider Features | Remote compliance monitoring; direct provider-to-patient messaging through app |
| Mask Compatibility | All standard 22mm CPAP masks — no adapter required |
| Altitude Compensation | Automatic |
| Display | Color screen with intuitive interface |
| Service Life | 5 years from first use (per manufacturer) |
| Warranty | 5 years — industry's longest on a standard CPAP machine |
| FAA Compliance | Yes — cleared for carry-on and in-flight use |
| HCPCS Code | E0601 |
| Prescription Required | Yes — FDA-regulated medical device |
| FSA/HSA Eligible | Yes |
What's Included
| G3 X APAP Machine (G4600) | Foam-free construction; color screen; integrated heated humidifier |
| Humidifier Water Chamber | 360 mL — push-down easy release; use distilled water only |
| 6-Foot Heated Tubing | Prevents rainout; maintains temperature and humidity in hose |
| Tubing Elbow Adapter | Connects heated tubing to machine output port |
| Reusable Air Filter | Pre-installed — clean as needed; replace approximately every 6 months |
| Disposable Ultrafine Filter | Included — replace approximately every 2 weeks if used |
| SD Data Card | For local therapy data storage and transfer |
| Cellular Module | Built-in 4G cellular modem — no separate purchase needed |
| AC Power Adapter and Cord | Universal input; US plug |
| Carrying Case | For transport and storage of machine and accessories |
| User Manual | Included |
Why Foam-Free Matters — Context and What the G3 X Does Differently
The Foam Issue in CPAP Machines
Standard CPAP machines — including all ResMed AirSense models and previous Philips Respironics devices — use polyurethane foam inside the machine chassis to dampen motor and airflow noise. The 2021 Philips Respironics recall (affecting millions of machines including the DreamStation and DreamStation 2) was directly tied to polyurethane foam degradation: aging foam inside the machine can break down into particles that enter the airpath and reach the user's airway, and can also off-gas volatile organic compounds (VOCs). The recall prompted widespread awareness that internal foam is a potential long-term safety variable in any CPAP that uses it.
What the G3 X Uses Instead
React Health engineered the G3 X with a proprietary honeycomb internal structure that provides the structural sound dampening previously handled by foam — without any polyurethane material in the chassis. The result is a machine with no foam anywhere near the airpath, no foam that can degrade over the machine's service life, and no off-gassing risk from foam aging. The machine achieves 28 dB quiet operation at 10 cmH₂O — comparable to foam-based machines — through the honeycomb geometry alone.
What This Means Practically
For most users, a foam-free machine provides peace of mind rather than an immediately perceptible difference in daily use. The therapy feels the same, sounds the same, and operates the same. The difference is the absence of a degradation mechanism that could theoretically affect air quality over the machine's 5-year service life — and the 5-year warranty reflects React Health's confidence in the construction's long-term durability.
Smart A™ Adaptive Pressure — How It Works
Standard APAP machines (including the ResMed AirSense 11 AutoSet) adjust pressure reactively each night based on what's happening in real time. Smart A adds a multi-session learning layer on top of this:
- After each successful therapy session (minimum 4 hours, leak rate under 90 LPM), the Smart A algorithm records your pressure data
- After five successful sessions have accumulated, Smart A analyzes the 50th percentile (median) and 95th percentile pressure across those sessions
- The Auto Min and Auto Max limits are automatically adjusted based on this analysis — narrowing or expanding the pressure range to match your actual therapy needs rather than the default range set at prescription
- The process repeats on a rolling basis — each new successful session replaces the oldest in the window, so the algorithm continues adapting as your pressure needs change seasonally or with weight changes
The practical effect is that users who consistently need only a narrow pressure range (common in many OSA patients) will have the machine converge toward that range over time — providing more stable, comfortable therapy rather than hunting across a wide range each night.
Connectivity — 4G Cellular, React Health Connect & Data Access Options
The G3 X provides more data access pathways than most competing machines:
| 4G Cellular Modem | Automatically transmits data to React Health Connect cloud platform — no Wi-Fi or action required from patient |
| React Health Connect Platform | Web-based cloud platform for providers: remote compliance monitoring, therapy adjustments, patient-to-provider messaging |
| React Health Plus App | iOS and Android — patient-facing compliance data, iCodeQR scanning, therapy history |
| iCodeQR On-Screen Code | Scan the code displayed on the machine screen with the app to instantly save a session summary without cellular connectivity |
| SD Card | Local data storage — insert into a PC for full session-by-session data review |
| Provider Messaging | Direct clinician-to-patient messaging through the React Health Connect app — therapy guidance without a clinic visit |
Frequently Asked Questions
Yes — the G3 X is an FDA-regulated CPAP device (HCPCS E0601) and requires a valid prescription from a licensed physician before it can be shipped. Upload your prescription at checkout or after placing your order.
All standard CPAP machines before the G3 X use polyurethane foam inside the chassis for sound dampening. The 2021 Philips Respironics recall — affecting millions of DreamStation machines — was directly caused by polyurethane foam degradation inside the machine, where aging foam broke down into particles and VOCs that could enter the airpath. The G3 X replaces internal foam with a proprietary honeycomb structure that provides sound dampening without any polyurethane material. This eliminates foam degradation and off-gassing risk over the machine's 5-year service life. React Health is the first manufacturer to bring a fully foam-free standard-size PAP to market in the US.
Standard APAP machines adjust pressure reactively each night based on what they detect in real time. Smart A adds a learning layer: after each successful therapy session, the algorithm records your pressure data. After five sessions, it analyzes your median and 95th percentile pressures and automatically adjusts the Auto Min and Auto Max limits to match your actual needs. Over time, the machine converges toward your personal pressure requirements rather than searching across a wide default range each night. This results in more stable, personalized pressure delivery — particularly beneficial for users whose optimal pressure range is narrower than the initial prescription range.
No — the G3 X's 4G cellular modem transmits data independently of your home Wi-Fi network. It connects directly to React Health Connect through the cellular network automatically after each therapy session. No setup, no Wi-Fi password, no smartphone required for data transmission. Your care provider can access your compliance data remotely without any action on your part beyond simply using the machine.
The G3 X detects and reports obstructive apneas, hypopneas, snoring events, central apneas, Cheyne-Stokes respiration, and mask leaks in real time. Central apnea detection and Cheyne-Stokes identification are clinically important for users whose sleep physician monitors for these event types — particularly patients with heart failure, neurological conditions, or complex sleep apnea presentations. Most standard APAP machines report only AHI without distinguishing event type; the G3 X provides the event-type breakdown needed for clinical decision-making.
Rainout — water condensation in the CPAP hose that causes gurgling sounds and water droplets reaching the mask — occurs when warm, humidified air from the machine cools as it travels through the hose and the water vapor condenses. Heated tubing maintains the air temperature throughout the hose length, preventing the temperature drop that causes condensation. The G3 X includes 6-foot heated tubing as standard — users who previously experienced rainout with non-heated tubing typically see it resolve completely with heated tubing.
Water chamber: empty daily, refill nightly with distilled water only (tap water causes mineral buildup). Clean the chamber weekly with mild soap and warm water, air dry completely before refilling. Heated tubing: clean weekly with mild soap and warm water; replace every 6 months. Reusable air filter: clean as needed; replace approximately every 6 months. Disposable ultrafine filter (if used): replace every 2 weeks. Machine exterior: wipe with a damp cloth. Do not use ozone or UV cleaners — these void the 5-year warranty.
Yes — CPAP machines and therapy supplies are eligible for FSA and HSA reimbursement. Save your receipt and submit to your benefits administrator. Replacement supplies (masks, tubing, filters, water chambers) are also typically FSA/HSA eligible.
Replacement Supply Schedule
| Supply Item | Replacement Frequency | Notes |
| Water Chamber | Every 6 months | Empty daily; fill nightly with distilled water only; clean weekly |
| Heated Tubing | Every 6 months | Clean weekly with mild soap; inspect for cracks |
| Reusable Air Filter | Every 6 months | Clean as needed between replacements; do not use ozone or UV cleaners |
| Disposable Ultrafine Filter | Every 2 weeks (if used) | Provides finer filtration in dusty or allergy-prone environments |
| CPAP Mask Cushion | Every 1–3 months (varies by mask) | Replace when seal degrades or cushion shows visible wear |
| Headgear | Every 6 months | Replace when elasticity is lost and fit cannot be maintained |
Compare Home CPAP Options
View G3 Auto →
View AirSense 11 →
View TravelPAP →
Why Buy From Medical Department Store?
- Authorized React Health dealer — genuine products with full 5-year manufacturer warranty support
- Full range of CPAP machines, masks, accessories, and replacement supplies
- FSA and HSA eligible — submit your receipt to your benefits provider for reimbursement
- Prescription upload available during or after checkout
Have Questions? We'll Help You Choose.
The G3 X fills a specific need — the first foam-free standard-size CPAP in the US, with Smart A adaptive therapy, full event detection including central apneas, 4G cellular, and the industry's only 5-year warranty. If you're comparing it to the ResMed AirSense 11, the React Health G3 Auto, or deciding between home and travel CPAP, contact us before ordering.
*Prescription required before shipment — FDA-regulated medical device HCPCS E0601. Use distilled water only in the humidifier water chamber. Do not use ozone or UV CPAP cleaners — use voids the 5-year warranty. 28 dB noise level measured at 10 cmH₂O working pressure; higher prescribed pressures produce more noise. Smart A algorithm requires 5 successful therapy sessions (minimum 4 hours each, leak <90 LPM) before first auto-adjustment. 4G cellular requires network coverage in your area; iCodeQR and SD card provide alternative data access. FSA/HSA eligibility subject to individual plan terms.
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