I don't think it has a cabin air filter.
The 1999 Nissan Maxima does not have a cabin air filter. It never came with one.
The cabin filter is behind the glovebox. look at the right side u will c a bolt and a small door and there is the fiters
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I found the diagram by googleing courtesy Nissan parts and searching forthat part name in the interior parts.
On the website www.nissanclub.com they have an excellent FAQ section for 2007+ generation Altima's. In it you will find a how-to with pictures on how to change your cabin filter.
google these 2 words nissan-autobestanswer- pdf file there.
How to change dashboard lights in primera 1999?