nVent Hoffman DFN01 The enclosure can be cooled in incremental steps with this high airflow fan, which can be mounted inside or on top of the enclosure.Feature: ventilation fan that mounts into the cut-outs of the roof fan plate, CFR, or onto the roof ventilation cover plate, CRBAdvantage: 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 generatedBenefit: the enclosure can be cooled in incremental steps depending on the number of ventilation fans installedBenefit: the forced ventilation provides a high cooling capacity which is a good solution in environments when the ambient temperature is 10 degrees or more, under the enclosure's desired internal temperature