That's MDF Medium density Fiber board. Or some call it Ranger board. I used it for my bench and shelves. The booth is painted drywall. The fan is just a motor and a fanblade built into a wooden box. No worry about explosion when sucking the little powder. wouldn't be in high enough concentration. But I do have a paper filter frame built up. I'll try to get pics of the fan and my real filter media soon. ATM, I am just stopping for brunch, almost have the oven all sided
Cleanup's easy because I put Lino on the floor. I just blow out the mass amounts of powder with the fan on high, then wash the walls and floor, spotless