Join Date: Dec 2019
Location: West Central Indiana
That DC has a 13" fan, so about 12"w.g. maximum vacuum. 30Ga HVAC snaplock duct will collapse. 26Ga will be OK, but is a little harder to find. Spiral pipe is good but more money. PVC Sewer & Drain (ASTM 2729 or ASTM 3034) will also work, no need for pressure pipe like Sch40 or even DWV.
The CFM claimed for that DC is wishful thinking. A 13" fan and 6" inlet and outlet will be more like 1600CFM, not 4944.
You'll get much better performance with 6" hose instead of 4", very roughly 780CFM vs 450CFM. That estimate doesn't include any bends, excess entrance loss, or the outlet ducting and bags, just the ducting you listed. Actual numbers will be less, those are stated only for relative comparison between the two hose sizes.