Filter fans perform a critical task of cooling equipment within electrical enclosures while also protecting equipment from ingress of harmful dust, water, or other materials. Cooling is necessary to protect sensitive electrical components from overheating and becoming damaged. When appropriate, filter fans are a popular choice for this cooling task due to their low energy usage and ease of installation. The fan component of a filter fan provides this critical thermal protection, while filters keep airborne particles like dust from getting into the enclosures and damaging the equipment inside. Filter fans also help to protect equipment from water, ice, snow, animal ingress, or vandalism, depending on the environment. Selecting the correct filter fan for a given application requires consideration of that application’s heat load information and what temperatures need to be maintained, as well as the environmental conditions.