My powder booth currently utilizes a 16×20 hepa filter to catch the powder that is sucked out by my box fan. Apparently this proves to be a real strain on the box fan as it’s starting to wear out really fast. I need a high velocity box fan. One that really pulls the air. A Box fan is almost a must for space reasons. I need one that will really move the air. Spark free doesn’t matter as the fan I currently have has taken on no powder at all. It still looks brand new on the backside. My filter catches close to 100% of the residual powder. I do have to replace it every two weeks but it’s worth it to keep my garage clean. Any ideas of where I can get such a fan?