The Extron ® MBD 249 Under-Desk Mount Kit (part number 70-155-01) lets you attach an Extron
2U high device to an equipment rack or through a desk or table.
• For rack mounting instructions, see the procedure below.
• For through-desk mounting instructions, see the next page (reverse side).
The following Underwriters Laboratories (UL ) guidelines pertain to the safe installation of electronic equipment in a rack.
1. Elevated operating ambient temperature — If installed in a closed or multi-unit rack assembly, the operating ambient temperature of the rack environment may be greater than room ambient temperature. Therefore, install the unit in an environment compatible with the maximum ambient temperature (Tma) specified by Extron.
2. Reduced air flow — Install the equipment in a rack so that the amount of air flow required for safe operation of the equipment is not compromised.
3. Mechanical loading — Mount the equipment in the rack so that a hazardous condition is not achieved due to uneven mechanical loading.
4. Circuit overloading — Connect the equipment to the supply circuit and consider the effect that circuit overloading might have on overcurrent protection and supply wiring.
Appropriate consideration of equipment nameplate ratings should be used when addressing this concern.
5. Reliable earthing (grounding) — Maintain reliable grounding of rack-mounted equipment.
Pay particular attention to supply connections other than direct connections to the branch circuit (for example, use of power strips).
Step 1 — Attach brackets to the device
Attach brackets to the device using eight machine screws supplied with the mounting kit. Use the bracket’s four lower holes, as shown in the diagram below.
Step 2 —
Attach brackets to the rack
Using four machine screws, attach the brackets to the mounting rack.
MBD 249
2U Rack Mount
Bracket (use four lower holes)
(Continued on reverse side)

Step 1 — Attach brackets to the device
Attach brackets to the device using the bracket’s slotted holes and eight supplied machine screws and washers (four per side), as shown in the picture below.
Step 2 — Mark screw locations
Hold the device with attached brackets against the underside of the furniture, and mark the screw hole locations (centers of the brackets’ screw slots).
Step 3 — Drill holes
Drill four pilot holes, each 3/32 inches (2 mm) in diameter, ¼ inch (6 mm) deep, at the locations marked in step 2 .
Step 4 — Install screws
Using the four wood screws (provided), attach the brackets to the mounting surface and securely tighten all screws.
Step 5 — Adjust device height
If desired, loosen the screws installed in step 1 and raise or lower the device slightly to adjust its height within the furniture, then tighten the screws snugly.
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