This section describes how to remove the currently installed front lower grille from the chassis.

Now that the inlet grille has been removed, you must remove the lower grille frame assembly.

This section describes how to install the new inlet grille frame assembly and the inlet grille screen.

In this task, you must first remove the lower grille screen from the frame, because the screws that attach the frame assembly to the chassis are inboard of the screen—that is, the new screen is shipped already installed into the new frame assembly, but you cannot attach the new frame to the chassis until you remove the screen first. When the new frame assembly is installed, you can reinstall the lower grille screen into the new frame.

Ensure that all power to the Cisco CRS Carrier Routing System 16-slot EC line card chassis is OFF prior to initiating the tasks to install the exhaust baffle.

1.    Remove the upper grille by unsnapping the bottom portion from the ball stud snaps on the vertical mounting brackets.

2.    Rotate the grille toward you on its hook hanger brackets, and then lift it clear of the brackets.

3.    Set it carefully aside.

4.    Be sure that all parts have been carefully set aside and repackaged appropriately.

The next task is to remove the upper rear fan tray as described in the next section.

Before performing this task, you must first remove the upper rear grille as described in the previous section.

You need the following tools to perform this task:

• ESD-preventive wrist strap
• Large flat head screwdriver
• Step platform

1.    Attach the ESD-preventive wrist strap to your wrist and connect its leash to one of the ESD connection sockets on the front (PLIM) side of the chassis or a bare metal surface on the chassis.

2.    If necessary, use a step platform to reach the upper fan tray comfortably.

3.    Using the screwdriver, loosen the two captive screws on the fan tray cover faceplate.

4.    Pull firmly on the cover to swing it free; some force may be required, as the rubber seals can stick.

5.    Grasp the fan tray handle and pull it straight out to disconnect the fan tray from the connector mounted on the front of the fan tray bay on the rear (MSC) side of the chassis. Slide the fan tray halfway from the fan tray bay.

6.    Use your free hand to support the fan tray, then slide the fan tray completely from the fan tray bay.

7.    Set the fan tray carefully aside.

You are now ready to install the exhaust baffle, as described in the next section.

Before performing this task, you must first remove the upper rear grille upper fan tray as described in the previous sections.

You need the following tools and components to perform this task:

• ESD-preventive wrist strap
• Cisco CRS Grille Kit: CRS-16-LCC-R-GRL=
• Number 1 flat-head screwdriver with at least a 9-inch shaft
• Step platform

1.    Attach the ESD-preventive wrist strap to your wrist and connect its leash to one of the ESD connection sockets on the rear side of the chassis.

2.    If necessary, use a step platform to reach the upper fan tray comfortably.

3.    Observe the four retention brackets at the front and rear of the exhaust baffle (see figure below).

4.    Using both hands, lift the exhaust baffle and insert it into the open bay as shown below.

5.    Align the rear retention brackets directly over the third rivets from the rear of the chassis (see figure below); then let the exhaust baffle drop down over the rivets.

6.    Pull the exhaust baffle toward you to make the retention brackets snug against the rivets.

7.    To secure the exhaust baffle to the chassis, use the 9-inch Number 1 flat-blade screwdriver to tighten the four retention bracket screws (see figure below).

Step 1	Attach the ESD-preventive wrist strap to your wrist and connect its leash to one of the ESD connection sockets on the rear side of the chassis.
Step 2	If necessary, use a step platform to reach the upper fan tray comfortably.
Step 3	Observe the four retention brackets at the front and rear of the exhaust baffle (see figure below). Figure 6. Exhaust Baffle and Retention Brackets
Step 4	Using both hands, lift the exhaust baffle and insert it into the open bay as shown below. Figure 7. Inserting the Exhaust Baffle into the Chassis Bay—Fixed Configuration Power Shown Observe the rivets on both sides of the open bay.
Step 5	Align the rear retention brackets directly over the third rivets from the rear of the chassis (see figure below); then let the exhaust baffle drop down over the rivets. Note    The front retention brackets will drop into the appropriate rivets. Figure 8. Fitting the Baffle Retention Brackets Over the Rivets 1 Front of chassis 2 Rear of chassis 3 Third rivet from the rear of the chassis, upon which the exhaust baffle rests 4 Exhaust baffle retention bracket sits down on the rivet
Step 6	Pull the exhaust baffle toward you to make the retention brackets snug against the rivets.
Step 7	To secure the exhaust baffle to the chassis, use the 9-inch Number 1 flat-blade screwdriver to tighten the four retention bracket screws (see figure below). Tip    Continue to pull the exhaust baffle toward you while you tighten the retention bracket screws. Figure 9. Securing the Exhaust Baffle to the Chassis 1 Tightening retention bracket screw with 9-inch flat screwdriver The exhaust baffle is now installed. You can now reinstall the upper fan tray.

Reinstall the fan tray, as described in the next section.

Before performing this task, make sure the exhaust baffle is correctly and securely installed.

You need the following tools and part to perform this task:

• ESD-preventive wrist strap
• Large flat-head screwdriver
• Fan tray (Cisco product number CRS-16-LCC-FAN-TR)
• Step platform

1.    If necessary, use a step platform to reach the upper fan tray comfortably.

2.    Attach the ESD-preventive wrist strap to your wrist and connect its leash to one of the ESD connection sockets on the front (PLIM) side of the chassis or a bare metal surface on the chassis.

3.    Using two hands to support the fan tray, position it in front of the fan tray bay so that the fan tray connector that is on the back of the fan tray lip is aligned with the connector mounted on the front of the fan tray bay (on the rear side of the chassis).

4.    Slide the fan tray into the fan tray bay. Stop when the fan tray makes contact with the chassis connector in the back of the fan tray bay.

5.    Firmly push on the fan tray handle to seat the fan tray connector in the chassis connector. When completely seated, the fan tray faceplate flanges meet the front (PLIM) side of the chassis.

6.    Replace the fan tray cover and tighten the two captive screws on the fan tray cover faceplate.

Now you can install the upper rear louver grille.