I have a window-unit Emerson Quiet Kool that's probably 15 years old.
The filter simply pulls up out of the grill. Maybe yours is different
(or maybe the filter is missing). I'll send you a scan of the page in
the manual that shows how my filter pulls out, and you can see if it's
similar.

Please send me a copy of the instruction in replacing air filter from
your Emerson Quiet Kool air conditioner. I appreciate your help.

Thanks.

Jay Chan