Open the inlet sheet metal of the dust collector to match your pipe. Then you don't have any restriction to worry about...
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I suppose I could potentially do that.? But I'm more inclined to purchase a dust collector that meets my needs out of the box.? Or maybe the phrase in this instance should be "off the pallet".? I doubt I'll buy a system with a 200mm inlet, they're generally more collector (including both price and size) than I really need.