Yu obviously don't have an owners manual.
If yu suspect the Rav has a cabin filter, it is located in the air box. I don't own a Rav, But yu can go to any auto parts store and get a Purolator Cabin filter . In the box it will have instructions on where it gets removed/installed. On a Rav I believe that to be pass. side of lower dash.
Usually accessible by removing the glovebox on some models.
See this link-http://www.pureoil.com/smartlink/?partnum=C38188
Yu can even go to Pureoil.com(Purolator) and get the instructions in PDF format downlod.
If one does exist for your Rav it will show that application among their Cabin filter selection.
my two cents
LT