The basic formula that can be used to choose the correct outdoor enclosure fan kit is: CFM =(3.16 x P)/ΔT.

P = internal component load (Watts) of heat production.

ΔT is the maximum temperature increase (°F) that can be allowed in the cabinet relative to the ambient temperature. At ACDCFAN, we propose a 20-25% safety variance to take care of the filter clogging over time. Our high-CFM filter fans ensure that your electronic vital parts do not exceed safe operating temperatures.

A standard metal enclosure is a Faraday Cage, but to cut an aperture for cooling, there is a potential for EMI leakage. From a physics point of view, any opening can behave as a “slot antenna” provided that its dimensions are large compared to the wavelength( λ )of the electromagnetic noise. This is a very common way of failure during EMC compliance testing.

To maintain shielding effectiveness, the fan unit must have electrical continuity of the surface of the enclosure to minimize contact impedance. Standard plastic fans have no attenuation and leave high-frequency digital circuits or sensitive analog sensors open to interference.

ACDCFAN deals with this technical challenge using EMC-certified cooling units. Instead of estimating shielding performance, we offer an official EMC Certification as proof of compliance. These units are designed to keep the shielding of your enclosure intact without adversely affecting airflow. By integrating a certified component, you simplify your system’s regulatory approval and provide long-term signal integrity.