The components that cause heat in the CNC electronics are the drivers. These drivers contain heat sinks and if enclosed within a space that does not have some type of air exchange, these driver may overheat. A simple fan, like the ones in a computer case is sufficient to provide this air exchange if installed properly. Keeping positive air pressure within the cabinet provides this air exchange and would not allow particles within this area.
To provide positive air pressure, install a cooling fan on a side of this enclosure oriented so that the air is moving into the enclosure. The air will need a place to escape and the position of these places are important to make sure the air passes the heat sinks of the drivers.
An air powered cabinet cooler may be more than is needed.
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Patrick have you ever considered using a air powered cabinet cooler for the electronics of the machine?