Fresh Air/Vented Cooling System Z23x
Introduction
As can be seen in the examples above exceeding the capability of natural convection cooling is quite possible
especially in increased ambient temperature environments. A possible next step in cooling management is to
provide ventilation to the zone enclosure with the addition of fans and vents. Fans will still result in a higher internal
temperature than the ambient air temperature outside the enclosure, however, the difference in temperature between
the external ambient temperature and the internal temperature is reduced. But, the addition of outside ventilation will
reduce the enclosure ingress rating to IP54. Some of the recommendations will be like the sealed enclosure but to
stress their importance they will be repeated as appropriate.
The cooler air brought into the enclosure by the fan allows the hot air to exhaust from the enclosure. Without the
vent the fan would stall, and no air would be brought into the enclosure. Therefore, two openings need to be created
on the enclosure, one for the fan and one for the exhaust vent. The fan should be mounted low on the non-hinge
side of the Z23 enclosure. The vent should be mounted high on the door of the enclosure. Figure 7 (fan HF09) and
figure 10 (fan HF05) show the location for a fan and a vent.
Two different fan sizes are available for the enclosure. HF09 fan is for deployments WITHOUT A POWER SHIELD
and the larger fan provides 42 CFM of airflow to cool the equipment inside the enclosure. Figures 5, 6 and 7 provide
the fan dimensions (HF09) and enclosure cutout dimensions.
The smaller HF05 fan provides 24 CFM of airflow to cool the equipment inside the enclosure. A similar mounting
location is recommended for the HF05 fan and figures 9 and 10 show the dimensional information.
Recommendations for Fan Assisted Systems Z23x
1. Follow vendor recommendations for minimum clearances around active equipment (e.g. 2" for convection cooled
switches) mounted in the enclosure.
2. Read the instruction manual available from the vendor for the fan. A hyperlink to the manual is provided at the end
of this document.
3. Follow vendor recommendations for minimum clearances around fans and filters (e.g. 7" for HF09 fan on the outside
of the enclosure).
4. Mount equipment with lower operating temperatures on the lower DIN rails.
5. On the lowest din rail, space needs to be left for the fan on the non-hinge side (see figures below).
6. On the highest din rail, space needs to be left for the vent mounted on the door to when installing equipment.
(e.g. switch patch cords extend beyond the face of the switch towards the door of the enclosure and could affect
a potential vent location).
7. Figure 4 provides the heat dissipation guide for a Panduit Z23 enclosure heat dissipation with a HF09 fan for various
external ambient temperatures with the IP54 filter kit.
8. Figure 8 provides the heat dissipation guide for a Panduit Z23 enclosure with a power shield and an HF05 fan with
the IP54 filter kit.
5
