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MX240 Air Deflector Kits

Optional air deflector kits are available that let you install the MX240 routers in a ventilation environment with designated hot and cold aisles. These kits convert the MX240 router from side-to-side ventilation into front-to-back ventilation, by directing ventilation with cold air to enter from the front and warm exhaust to exit from the back. The air deflectors contain no additional fans, so they require no additional electrical power.


The air deflector kit must be installed along with the device. It cannot be installed if the device is already installed on the rack.

The air deflector kits consist of four main components: two intake/exhaust boxes and two side plenums.

  • Top plenum
  • Bottom plenum
  • Right plenum
  • Left plenum

The top and bottom plenums are identical to each other, as are the right and left or side plenums. See Figure 1 and Table 1 for the list of components that comprise the air deflector kit.

Figure 1: Components of the Air Deflector Kit Components of the Air Deflector Kit
Table 1: Air Deflector Kit Components




Two side plenums (one for right and one for left)

2 and 4

Top plenum and bottom plenum


Rear mounting brackets


Perforated screens


Mounting brackets supplied with the air deflector kit for the router

Air flow in the air deflector kit is from front to rear, and the orientation of the top and bottom plenums is critical to ensure air intake happens from the front and exhausts through the rear.

The plenums are installed above and below the router to direct intake air from the air space in front of the router into the side plenum mounted on the intake side of the device. The intake air plenum directs air into the device, and the exhaust air plenum directs the exhaust air to the opposite side of the device. The exhaust plenum directs the exhausted air into the exhaust plenum above the unit, where it is expelled into the air space behind the router.

The air deflector kit requires additional space around the device. Table 2 and Table 3 summarize the physical specifications and rack space requirements for the air deflector kit. See Figure 2 for more information.

Table 2: Air Deflector Kit Physical Specifications


Dimensions and Weights

Top and Bottom Plenums

Side Plenums


26.16 in. (66.44 cm)

15.64 in. (39.72 cm)


17.62 in. (44.75 cm)

19.9 in. (50.54 cm)


3.5 in. (8.89 cm)

5.55 in. (14.09cm)


16.5 lb (7.45 kg)

10.6 lb (4.8 kg)

Figure 2: Rack Space Requirements Rack Space Requirements
Table 3: Rack Space Requirements



Rack height

9 RU (40 cm)

This includes 2 RU (8.89 cm) of the top plenum, 5 RU (22.22 cm) of the router, and 2 RU (8.89 cm) of the bottom plenum.

During this installation, we recommend that you allocate an optimum rack height of 18.15RU (80.68 cm) for ease of installation.

Distance between the rear rack mounting surface and front rack mounting surface

27.5 in. (69.85 cm) to 29.5 in. (75.43 cm)

Minimum internal space required to install the side plenums (centered horizontally within the rack)

29 in. (73.66 cm)

Maximum depth of space behind the front and rear mounting surfaces

3 in. (7.62 cm)


As per EIA Standards, the rack mounting surfaces must conform to 19 in. or 48.26 cm.

Figure 3 shows the MX240 router installed in typical four-post mounting racks with the air deflector kit parts in place.

Figure 3: MX240 Router Air Deflector Kit MX240 Router Air Deflector Kit