I'm in the process of building The One True Solution (tm) for dust collection, and found myself wanting to use only hard pipe, but don't know if vibration is an issue. I will have 5" from inside the shop going outside, into a mini shed to house the DC components. That line goes into a steel Oneida Dust Deputy, and then the 6" outlet from that to a 3HP blower/motor. I'm using 5" spiral pipe in the shop (already have it) and plain 6" pipe with hand-made smooth sweeps inside the shed. The blower/motor will be bolted to the 23/32" ply "floor" and the cyclone will be mounted to a plywood platform. The barrel will be on a slide drawer below it with a short flex hose and QD clamp.

Do I *need* to have some short pieces of flex between the cyclone and motor, and/or cyclone to house? I see lots of people have 6-12" pieces in locations like that, but not sure if it's really important.