风扇，DFN

Feature: Ventilation fan that mounts into the cut-outs of the roof fan plate, CFR, or onto the roof ventilation cover plate, CRB.

Advantage: Ventilation fans can be mounted onto the roof plates, CFR or CRB, which allows the customer to install the required number necessary to achieve the desired air flow, based on the amount of heat dissipation generated.

Benefit: The enclosure can be cooled in incremental steps depending on the number of ventilation fans installed. The forced ventilation provides a high cooling capacity which is a good solution in environments when the ambient temperature is 10o or more, under the enclosure's desired internal temperature.