Guidelines for planning the cabinet installation 33
Minimum air inlet and outlet grating sizes
Preventing the recirculation of hot air
Prevent hot air circulation outside the cabinet by leading the outcoming hot air away
from the area where the inlet air to the cabinet is taken. Possible solutions are listed
below:
• gratings that guide air flow at the air inlet and outlet
• air inlet and outlet at different sides of the cabinet
• cool air inlet in the lower part of the front door, and an extra exhaust fan on the
roof of the cabinet.
Prevent hot air circulation inside the cabinet with leak-proof air baffles or an extra fan
at the inlet or outlet of the cabinet. If you use a fan, we recommend an inlet fan with a
filter. Such a fan causes an overpressure inside the cabinet which helps to keep the
dust out. No gaskets are usually required.
Frame
size
Minimum effective area of cabinet air
inlet (cm
2
)
Minimum effective area of cabinet air
outlet (cm
2
)
IP22 IP54 IP22 IP54
R1 175 250 350 550
R2 225 350 450 700
R3 275 450 550 900
R4 350 550 700 1100
R5 400 650 800 1250
R6 475 750 950 1500
R7 650 1100 1300 2000
R8 1000 1600 2000 3200
R9 1500 2400 3000 4800
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