Flow Of Hot Air - Mitel 470 System Manual

4. 2. 4

Flow of hot air

The Mitel 470 communications server comes with a fan already pre-installed. The
housing is designed so the air flow is first guided at two levels over the processor cards
and the interface cards, then passes through cutouts in the backplane, absorbs the
heat from the power supply unit, and exits the housing through the fan aperture.
Fig. 18 Flow of hot air
The fan speed depends on the ambient temperature, the number of cards and mod-
ules, and the communication server load, and continually adapts to the current temper-
ature inside the housing.
Note
Make sure all the housing openings on the communications server are always closed and
secured by screws during operation to ensure a controlled flow of air. This applies in particular
to the interface cards and processor cards, but also to the dummy covers and housing covers.
Mitel 470 as of R4.1
syd-0585/1.2 – R4.1 – 08.2016
Installation
95