Got an email from my buddy Stuart today. He says, "Between the progress on the trains and the pool, I can't read your blogs anymore...can't you just go back to sticking your head in the fan? It makes for a much better read..."

We had the same idea for the dust box fans: "you might try using fans from old computer hard drives. they run quiet and on 12 volts. I keep one on my workbench hooked up to an old MRC power pack, to keep the fresh air flowing. you can probably find a few curbside on trash day..."

Since I used to run a computer forensics lab, I've got a few of those on hand. I was going to gang them up and build a frame for a furnace filter on the intake side. Should work great.