Cleaning Front Dust Screen - Lenovo 90H9 Hardware Maintenance Manual

Step 3. To reattach the bezel, align the plastic tabs on the bottom of the bezel
with the corresponding holes in the chassis, and then snap it into
position.

Cleaning front dust screen

To replace the system fan:
Step 1. Remove any media (disks, CDs, DVDs, or memory cards) from the drives,
shut down the operating system, and turn off the computer and all
attached devices.
Step 2. Unplug all power cords from electrical outlets.
Step 3. Disconnect all cables attached to the computer. This includes power
cords, input/output (I/O) cables, and any other cables that are connected
to the computer. Refer to "Left and right view" and "Rear view" for help
with locating the various connectors.
Step 4. Remove the computer cover. Refer to "Removing the computer cover".
Step 5. Remove the computer cover. Refer to "Removing computer cover".
Step 6. Remove the front bezel. Refer to "Removing the front bezel".
Step 7. Pull the out the front dust screen as shown.
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Lenovo Legion Y720T Hardware Maintenance Manual