SMJ Fans specializes in the design, manufacturing, and commissioning of primary and auxiliary ventilation fans ranging from 12 inches to 12 feet in diameter, with configurations including single or dual stage, horizontal or vertical mounted, contra-rotating, silencers, scrubber systems, starters, and crawlers. They cater to a wide range of industries, including coal and hard rock mines, tunneling and construction contractors, educational facilities, and other industrial applications. SMJ Fans has a strong track record of delivering MSHA X/P permissible mine fans and non-permissible ventilation systems tailored to meet specific customer requests and design criteria, with a global customer base across the United States and worldwide.