I'm wondering, though, about the distance AND direction that dust would have to travel. Let's assume I get the equivalent of Harbor Freight's smaller dust collector with 660 CFM.
1) I have a hole in the cinderblock wall that is 5 feet off the floor of the workshop. If I put the dust collector on the dirt floor of the crawl space, the main hose would go up 4 feet, and then back down 5 feet to reach the floor of the workshop. The hose would need to be even longerto attach to several different pieces of equipment. At what length does the hose become too long to do what's needed? I would use a shopvac for regular clean up but the dust collector for dust.
2) A second option would be to build a mount on the crawl space side of the wall such that the dust collector is located basically 5 feet off the floor at the same level as the existing hole in the wall. This means that the hose, when connected to my shop smith would only have a 2 foot upward angle, and I'd probably want the flexibility to extend that hose about 8 feet to accomodate the shopsmith and a few other smaller machines.
3) A third option is to cut an additional hole in the cinder block wall specifically to run the hose through at the level of the crawlspace floor. I'd prefer not to go this route, simply because I"ve never cut a hole in an existing cinder block wall, but, like everything, that's just because I don't know how to do it.
Thanks again for your guidance....I have already learned a ton about dust collection from this forum!