Here's a photo showing how the filter-cover panel is attached:
link To remove it, just pull upwards very firmly so those metal "fingers" disengage.
The fans are held in place with two-part plastic rivets. To get them to let go, pull up on the head of the inner half of the rivet, which slides into the other half. Use your thumbnail or a small screwdriver blade or something (don't scratch your case, though! :Q). Alternately, reach up from underneath and push the end of the inner half upwards from below.
I also recommend removing the stamped-aluminum inner fan grilles, which increase noise and reduce airflow. Hope that helps!
