VFD Overheating and Cooling System Failures: Causes and
Ideally, prevent dust ingress in the first place: for harsh environments, consider sealed enclosures (NEMA 4/4X or IP66) plus a closed-loop cooling device (air-to-air heat exchanger or coolant
Akwscyby Outdoor Electrical Box, Waterproof Electrical Junction
Outdoor Electrical Box, Waterproof Electrical Junction Box IP65 ABS Plastic Enclosure with Fan & Thermostat, Mounting Plate and Hinged Lid (15.7" H x 11" L x 5.9" W)