Air flow in cabin filter

Discussion in 'Prime Care, Maintenance and Troubleshooting' started by pakitt, Nov 22, 2022.

  1. pakitt

    pakitt Senior Member

    Joined:
    Aug 10, 2009
    2,093
    1,248
    0
    Location:
    Colorado
    Vehicle:
    2021 Prius Prime
    Model:
    Limited
    Does the arrow “up” on the cabin filter frame in the same direction of air flow or not?
    The replacement filter I just received has an “air flow” arrow, and the instructions say to put it in with the arrow pointing “DOWN”. Which is in the opposite direction of what the arrow in the case shows as “up”.
    What is the direction of air flow? Down going up? Or up going down?
     
  2. ChapmanF

    ChapmanF Senior Member

    Joined:
    Mar 30, 2008
    19,373
    12,932
    0
    Location:
    Indiana, USA
    Vehicle:
    2010 Prius
    Model:
    IV
    Some makes of filter come marked with an arrow for airflow direction, and others come marked with an arrow for UP.

    While I don't know for sure the airflow direction in a Prime, it is definitely down for Gen 1 through Gen 3 and the geometry of the dash and heater box pretty strongly weigh in that direction.

    So if you have a filter with an airflow arrow, point it down. If you have a filter with an up arrow, point it ... up.
     
    road2cycle and pakitt like this.
  3. FuelMiser

    FuelMiser Senior Member

    Joined:
    Jun 29, 2008
    1,116
    786
    0
    Location:
    Monument, CO
    Vehicle:
    2016 Prius
    Model:
    Touring
    I'm sure the Prime has the same air box design as Gen 4 Hybrid, so air flows from top to bottom through the filter.
     
    pakitt likes this.
Loading...