The Middle Atlantic ERK-4QFT-FC is a high-performance cooling solution featuring Thermostatically Controlled Integrated Fan Tops. It ships fully assembled and. Includes three 4-1/2 inch fans, fan guards, and a proportional speed fan controller that enhances fan life, reduces noise, saves energy, and minimizes dust buildup. This unit is ETL listed in the US and Canada, ensuring compliance with safety standards. The fans operate only when necessary, optimizing energy use and reducing maintenance. Designed to fit WMRK, ERK (35 space and higher), ERK-KD (all heights), and SCRK racks, this fan top is constructed from durable steel with a sleek black finish.