Both. There are two HEPA filters in your A/C system.
Howard
"dbaron" <dbaron38@heyoptonline.net> wrote in message
news:PS9sd.83$4r6.16@fe12.lga...
> Anyone know which filter is needed for the cabin air filter unit? I've
> looked at a couple online parts stores and there are like two different
> kinds, here's an example:
>
>
http://www.hondaautomotiveparts.com/...p?inputstate=5
&catcgry1=Civic&catcgry2=2003&catcgry3=4DR+LX&catc gry4=KA5MT&catcgry5=HEATER
+BLOWER
>
>