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Replacement calculator

CPAP Filter Replacement Calculator

Estimate how often to replace your CPAP filter based on filter type, pets, air quality, allergies, and humidifier use.

30days

Typical

Your schedule

Replace a disposable CPAP fine filter about every 30 nights; ResMed and reusable filters about every 6 months.

Use the inputs below to tailor this for your filter type, environment, allergies, and whether you use a humidifier.

  • Filter type is the biggest variable — disposable filters last weeks; reusable foam lasts months.
  • Pets significantly increase airborne dander load, shortening disposable filter life noticeably.
  • Dusty, smoky, or polluted sleep environments clog filters faster and warrant weekly visual checks.
  • Allergies and humidifier use are reasons to replace proactively, before visible discoloration appears.

Recommended replacements

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Inputs

How to identify your filter
  • ResMed AirSense 10/11 machines use a single non-washable air filter; ResMed rates it for up to six months.
  • Philips DreamStation uses two: a disposable ultra-fine filter (30 nights) and a reusable pollen filter (rinse every two weeks, replace every six months).
  • Hypoallergenic filters are labeled for fine particles; check your machine's manual for its schedule.
  • Unsure? Your user manual's cleaning section lists the filter and its replacement interval.

Your machine's brand sets the schedule

CPAP filter schedules differ a lot between manufacturers, so start with what your machine uses:

  • ResMed AirSense 11: ResMed's user guide says to replace the air filter (standard or hypoallergenic) every six months, and sooner if it has holes or is clogged with dirt or dust. These filters are not washable.
  • Philips DreamStation: two filters. Replace the disposable ultra-fine filter every 30 days, or sooner if it looks dirty. For home use, rinse the reusable pollen filter monthly and replace it every six months.
  • Other brands: check your manual; the same two-filter pattern is common.

What insurance allows

Medicare's supply schedule allows two disposable filters a month and one non-disposable filter every six months. That's an allowance for how often supplies can be billed, not a medical requirement. It's useful to know, because many resupply companies will ship on that schedule automatically.

When to replace early

A filter that's clogged or damaged forces the machine to work harder and lets through the particles it's meant to catch. Replace it early if it's discolored, torn, or visibly dusty. Pets in the bedroom, a dusty room, and allergies all shorten the interval, and the calculator adjusts for each.

This calculator is a personalization aid, not medical advice. Follow your equipment manual and your care team's instructions.

FAQ

How often should I replace my CPAP filter?

It depends on the machine. ResMed says to replace AirSense 11 air filters every six months, or sooner if clogged or damaged. Philips DreamStation disposable fine filters are replaced every 30 days, and its reusable pollen filter every six months. Your manual is the final word.

What happens if I don't replace my CPAP filter on schedule?

A dirty or clogged CPAP filter restricts airflow, forces the machine motor to work harder, and stops filtering allergens and particles effectively. In the worst case, a saturated filter can become a source of contaminants rather than a barrier to them. For users with sleep apnea, compromised airflow can also affect therapy effectiveness.

Do pets really make a difference for CPAP filter life?

Yes. Pet hair and dander are exactly what the intake filter catches, so a pet that sleeps in the bedroom can discolor a filter well ahead of schedule. Check the filter weekly if you have pets or allergies, and replace it early if it's gray, clogged, or torn.

Do I need to replace both the disposable and reusable filter in my machine?

Most CPAP machines use both a reusable foam filter (in the back of the machine, for large particles) and a disposable fine filter (usually in a slot near the intake). Both need to be maintained on their own schedules. Check your machine's manual to confirm which filter types your model uses and where they're located.

Sources

Last reviewed .How these estimates are made.

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