Adapter not included. This refill 4-pack is intended for use with the CSpring ULTRA housing system.
The CSpring ULTRA HEPA Filter delivers high-efficiency air purification with zero hassle. Its advanced 3-stage design targets dust, allergens, and odors—elevating your CPAP therapy with every breath. Breathe cleaner, install in seconds, and stay focused on better sleep.
• Three-Stage Filtration System – Combines an H13 HEPA core, activated carbon pre-filter, and non-woven fiber post-filter.
• High-Efficiency H13 HEPA Core – Filters ≥99.95% of particles ≥0.3 μm, including dust, allergens, and many bacteria- and virus-carrying droplets.
• Activated Carbon Layer – Helps neutralize odors and trap larger particles before they reach the HEPA core, extending filter life.
• Non-Woven Post-Filter – Adds a clean finishing layer and helps contain loose particles.
• Simple Replacement – Installs in seconds with no tools required. Designed to fit seamlessly with your CPAP.
• Better Air, Better Sleep – Regular use supports a healthier CPAP experience by reducing exposure to airborne contaminants.
Standard OEM filters are designed to protect the CPAP machine — not your lungs. The CSpring ULTRA filter goes further, combining carbon + H13 HEPA + paper layers to remove 99.95% of fine particles, dust, and odors — giving you cleaner air with every breath.
The CS Ultra HEPA Filter does not restrict airflow under real CPAP conditions.
It works with the AirSense / Aircurve PAPs across the full pressure range.
In both passive and active use, breathing remained natural and unrestricted.
This filter is fully compatible with CPAP therapy and maintains user comfort.
⚠️ Notice:
This product is not manufactured by or affiliated with ResMed. It is not FDA-cleared and is not intended to diagnose, treat, cure, or prevent any disease. Use only as a supplemental air filter for general comfort and cleanliness. Always consult your physician before modifying CPAP equipment or therapy.
No. The CS Ultra mounts outside your CPAP’s air intake and does not interfere with internal pressure sensors or airflow delivery.
The CS Ultra provides advanced HEPA filtration at the CPAP air intake, which many users choose to use in place of standard internal filters. However, because every machine is different, we recommend reviewing your manufacturer’s maintenance guidelines before removing or discontinuing internal filters.
Remove the existing air filter grill from your CPAP. The CS Ultra connects directly to the intake using the included adapter. Installation is quick, tool-free, and fully external.
Note: Always follow your CPAP manufacturer’s instructions regarding filter replacement or internal filter use.
Test Conditions
• Machine: ResMed AirSense 11
• Sampling rate: 100 Hz
• Test Phases:
1. No filter, mask off
2. No filter, mask on
3. With CS Ultra HEPA filter, mask off
4. With CS Ultra HEPA filter, mask on
1. No Filter – Mask Off
• Free, unrestricted airflow
• Slight fan flow from the machine
• No added resistance
2. No Filter – Mask On
• Natural breathing cycles observed
• Inhalation and exhalation were strong and smooth
• Flow ranged from +40 slm to -100 slm
3. With CS Ultra Filter – Mask Off
• Airflow nearly identical to no-filter condition
• No meaningful pressure drop
• Excellent passive breathability
Dimensions: 45 mm × 15 mm × 18 mm
Pleats: 4 pleats (6 folds along 15 mm side)
HEPA Surface Area: ~64.8 cm² (pleated media)
Airflow Support: Up to 100 L/min
Dust Holding Capacity: Extended due to large surface area
Compatibility: ResMed AirSense / Aircurve 10 and 11
✅ CSpring ULTRA: H13 HEPA + Carbon
❌ ResMed OEM: Basic (non-HEPA)
✅ CSpring ULTRA: 99.95% or higher at particles 0.3 μm and above
❌ ResMed OEM: Approximately 60–80% at particles ≥5 μm
✅ CSpring ULTRA: 2 mm active carbon layer
❌ ResMed OEM: No
✅ CSpring ULTRA: About 64.8 cm² (pleated)
❌ ResMed OEM: About 13 cm² (flat)
✅ CSpring ULTRA: User-level air purification
❌ ResMed OEM: Basic device protection
✅ CSpring ULTRA: 3 layers
❌ ResMed OEM: 1 to 2 layers
