If you want to create Maya nHair, convert to NURB surfaces and extract curves.
1. Select all polygon tubes
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3. Convert to Subdiv first.
4. Then convert to NURBS.
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8. Extract curves.
9. Make sure U or V direction. Usually, duplicated side has reversed surface.
Instead of choosing V to fix direction, you can reverse the surface itself. see the next picture below.
10.
11. Swap U and V
Make sure the squre points appear on the beginning of the curve.
If you see the squre points on the end, reverse the curves.
12.
If you want to select curves only and don't want to select faces, turn off the face icon.
Select curves and group them.
13. Now it's ready to assign nHair.
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