[Equipment] Always use a hypoallergenic filter instead of the standard one.

[ejbpesca]

There is no efficiency claim for a hypoallergenic filter, only that it is made of material not associated with allergies or sensitivity. https://www.healthline.com/health/allerg...c#overview  

If it gives you comfort to use something labeled as hypoallergenic, then go for it. Many members have mentioned more restrictive filters can affect therapy, but as I said, the filters labeled hypoallergenic do not claim higher filtration factors or higher or lower pressure drop across the filter.  If you don’t see a ASTM testing criteria, claims are simply a word the manufacturer has chosen to use. What we know is that the filters are mainly present to protect the internal components of the device, not air quality for the user.

ResMed makes two filter types.  One hypoallergenic and the other standard.  The description for the genuine ResMed hypoallergenic filters claims to trap allergens to protect the patient, not just the machine.  These filters begin to discolor within days of use.  Non-ResMed filters I've used do not discolor after a month of use.  The non-ResMed filters I've been provided through insurance accepting DME have exposed loose fibers.  The ResMed brand has a membrane-like covering over the fibrous filter material.