Cabin Air Heppa filter mod

Are you talking about your engine air filter? Or some other one? Is there a filter that is dedicated to cabin air? If you constrict the airflow to the ICE, you may end up worsening your mileage.

 

I am anxious to find out how this works for you. I would love to have better filtration in both our Prii. Dust seems to be an ever present problem along with pollen.

 

Cutting down better filters to fit Prius 20.5 cm square hole has been a common modification. The only concern is to not use something that will slow down the fan motor, so a listening test is appropriate.

I would not be quick to label any of these as "high efficiency particulate air" filters though, because the standards for that are very strict. 99.97% of 0.3 micron particles. Typically they are much thicker than the <3 cm you have to work with. Also, flow restriction would be an issue, as abve.

Nevertheless this is another example of how Prius cabin air filtration can be improved at low expense.

 

It would seem that these benefits only last until someone rolls down a window or opens a door. Not sure my nasal passages would be able to tell the difference.

 

did that mod in my 04... didnt work all that well. air flow was restricted and i wrote it off to the wrong filter selection. but it seemed the best options were too thick to work well plus, i am a "roll the window down" type of guy anyway... limited freeway driving (traffic on I-5 in Puget Sound Region is a joke) since most of the time i can get where i want faster on surface streets. (thanks to combo of mapping programs and GPS systems used to make me aware of alternate routes)

for some a better air filter would definitely be worth the trouble to experiment. if i still lived in So. Cal. i would be doing it without question... but here, AC is not often "needed" (i say that knowing high in the 90's today...but that is rare here. normal highs for this time of year is 75º)

 

good idea. I am allergic to plants, dust, and trees. I just had mine cleaned out by toyota. They just cleaned it out and charged me 40.00 for it which I thought was terrible. I may do it myself next time.