I am a professional sand blaster and attempted to expand my business last year by quoting large commercial and some residential work, I purchased this fan new for a specific job. I bought two 20" fans, one 12" fan, and ducting and dust socks for all three. The fans I used worked beautifully. They are very powerful! I did NOT use the specific setup for sale here as the other two fans worked well enough alone..
This is a 20" explosion proof fan (220V AC), 1100W, moves 165 m³/min air. Includes grounded duct, and 5' x 20' dust sock. All are BRAND NEW, NEVER USED. The fan never even got a plug installed on the cord! The fan moves 165 m³/min.
I originally tried to buy Black max fans but they were thousands of dollars each, which was not affordable at the time. I researched some other brand and found they all looked the same as if they were made in the same factory. I traced it back to a Chinese mfr. I approached their importer directly and bought the fans. Each setup was over $800. I have priced this to sell and to make some room in my ever tighter shop!