Aftermarket Cabin Air Filter for the Mazda CX-9?

How to replace cabin air filter

Hope you can help me. Where is the cabin air filter and how to replace it? Thanks
 
Cabin filter is behind the glove compartment.
1) push in the anchors on both side of the compartment door while holding it (don't let it free fall)
2) you will see a white plastic door
3) unlatch it on the left side
4) you will see the rectangular piece of filter.
Reverse the process to install.

You should change the filter 10K - 15K.
It gets dirty fast!!!
 
Dumb question. Which direction does air flow? I pulled my old filter out and didn't make a mental note of which way it was installed.
 
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