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Practical example of a fan-and-filter unit<br />
Fan-and-filter units are used in virtually all segments of industry:<br />
from the smallest enclosures, to command panels and<br />
consoles, through to large and bayed enclosure systems.<br />
They are the easiest method of protecting against overheating<br />
and hotspots.<br />
The basic pre-requisite for their use is that the ambient temperature<br />
must be significantly below the enclosure internal<br />
temperature.<br />
A wide range of control units such as thermostat, hygrostat<br />
and speed control for noise minimisation extend the applications<br />
e.g. to include the office sector and laboratories.<br />
EMC fans meet the requirements for increased RF shielding.<br />
Particularly when using fan-and-filter units in conjunction with<br />
PC enclosures or monitor panels, DC variants are used which<br />
provide effective protection from interference.<br />
Sealed and shielded<br />
<strong>Rittal</strong> <strong>System</strong> <strong>Climate</strong> <strong>Control</strong><br />
Also available with EMC<br />
shielding<br />
All fan-and-filter units and<br />
outlet filters are alternatively<br />
available with EMC shielding.<br />
The required conductive<br />
connection is achieved<br />
via a metallic coating on the<br />
fan-and-filter unit housing<br />
and a special sealing frame.<br />
Protection functions<br />
The membranes of the fan<br />
grille in the form of a rain<br />
canopy provide exceptional<br />
protection against the<br />
ingress of splashed water<br />
and dust.<br />
Protection category IP 54<br />
is achieved as standard.<br />
Fan-and-filter units<br />
Potential applications/selection critiera<br />
1<br />
1 Small enclosure<br />
2 Command panel<br />
3 Console<br />
4 Bayed enclosure/large enclosures<br />
5 PC enclosure<br />
5<br />
5<br />
2<br />
3<br />
Hosed water protection<br />
Particularly for applications<br />
in the food industry, the<br />
hose-proof hood prevents<br />
the ingress of damp. The<br />
protection category IP X5 is<br />
achieved in conjunction with<br />
additional fine filter mats.<br />
Important<br />
● The prescribed heat loss<br />
and the maximum anticipated<br />
ambient temperature<br />
define the required<br />
volumetric flow<br />
● Always use the fan-and-filter<br />
units and outlet filters<br />
together<br />
Calculation formulae,<br />
see page 30 or refer to the<br />
Internet at www.rittal.com<br />
4<br />
67<br />
8.2
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