Mark:
You should have been there the first time I emptied the Vacuflo. OMG. I dumped the 30 gallon full dirt container into an empty trash can in the garage. Talk about a dust storm. I had to go inside and take a shower and wash m hair. It was god-awful.
When we moved to our new house almost two years ago, one of my best friends, Evan Rogers, to whom I sold my vacuum shop when the Vacuum Museum was built, was doing the install of the old Power Unit into the "new to us" home. He had all kinds of trash from the installation, pieces of piping, bags that stuff came in, etc. We tested out the installation by sucking up damp paper towels (the same thing as Tornado Cloths). Since he also put in three ElectraValves, as well as a garage valve and two Wally Flex units, we decided to test the machine out with dirt.
I have other vacuums in my home that I also use. Some take disposable bags, like my Kirby. We tore apart those bags, and sucked up the dirt into the Central Vac. It took the dirt like a champ, but then we decided to empty the Vacuflo.
Since the trash can was 9/10 full of other trash, emptying the central vac didn't result in a dust cloud. I kind of 'poured' the dirt on top of all the stuff in the trash can, and not even my hands were dirty after. Maybe because the dirt didn't 'hit' the bottom of the trash can.
At a vacuum convention two years ago, many people came over to my home for a Cocktail Party. Half way through, I got the bright idea to have all my guest go outside, and watch the exhaust vent as I sucked up three full vacuum bags of dirt "at once' as fast as I could get the dirt to go into the Hide-A-Hose. Which of course is NOT what the system was designed to handle. It belched all kinds of fine dust outside, many of my friends caught the expulsion on their cell phone cameras. Like demons escaping from hell, the black cloud of dust just shot out the eves of the house, where the exhaust vent was. Everyone came back in laughing, (or was that chocking, I don't remember), and had another drink. Good times. In good fun, they ripped me apart for my 'dust belching' central vac for days. Gotta love your friends.