CHICAGO — Big Ass Fans is introducing the new Powerfoil X™ industrial fan. It ranges in size from 8 to 24 feet, using its size and patented aerodynamic design to optimize airflow over large areas. The fan features the NitroSeal Drive™, which is filled with nitrogen and sealed for life to ensure zero moisture, zero contamination, and zero maintenance, says the company. Prewired, onboard controls reduce electrical noise and allow for easier, less costly installation.