Furnace Air Filter Location (model #+new pics)?

I have this furnace: http://www.searspartsdirect.com/model-part/867734680/0582/0912130/00006189/00002.html

But, I still can't find where the air filter goes?

I have also included some new pics below: http://imgur.com/ORWqVjK (upper grille) http://imgur.com/FV1XB1w (lower part)

http://tinypic.com/r/206g5mw/9 (whole unit, old pic)

submitted by /u/harryloweishome
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