Are you asking what direction you should install the cabin filter? Is there an arrow on the cabin filter?
Thanks, I followed your direction and the air is flowing downwards.I think you should be able to find out by removing the cabin air filter and turning on the fan. Put your hand in where the cabin air filter was and feel which way the air flows. Be careful with your fingers...I'm not sure where the fan is exactly...or use a bit of string tied to a pencil.
Based 2 of my Toyota’s, the arrow on the frame just points up so you know how to install the frame. Both old filters had sediment on top so air flow direction is down.The Cabin filter consists of two parts the frame and the filter. The frame (after removing the glove box) can only go in one way and when you pull it out it will have an arrow sign that shows the air flow. The filter has a arrow sign on one side, when you change the filter make sure the arrow is in the same direction as the arrow on the frame. Even though the filter is squarish it is a little rectangular so it will only fit in one direction.