We have recently constructed new dust-test chamber (approx 800mm x 800mm x 800mm) in which we test our industrial printers functioning in dusty environments. Currently we have 4 small axial fans (201m[SUP]3[/SUP]/hr, 4200rpm, 11W â€“ 120x120x32mm) mounted in a row which blow talcum powder around inside the cabinet after the operator inserts a measured amount, with the intention that the talc is blown into the printer interior to see what affect it has. The fans are mounted on one end of the cabinet floor and blow the settled talc across to the other side of the floor where it is diverted upwards via a deflector. However, we have found that the fans are not quite man enough to keep the talc in suspension. After running for a while the talc settles on the chamber floor and only a small amount remains in suspension. We are looking to use more powerful fans to keep all the talc in suspension. Would the approach be to upgrade to axial fans with a higher volumetric flow or should we rather be using fans with a higher speed? (or both?). Another axial fan spec which I saw was: 222m[SUP]3[/SUP]/hr, 14000rpm, 38W â€“ 80x80x38mm. This one has a smaller casing and slightly higher flow than the existing fan, but over 3x the speed and power. Would this be a good option to try out? Or should we possibly be using a different type of fan? Any suggestions would be very much appreciated.