My Fantastic Fan simply does not require -that- much amperage to worry about robbing from a convenient pair of wires. The trick is making sure the wires to be robbed from are hot all the time.
Who in their right mind would wire a dual voltage system with incorrect NEC wire colors?
The "Hot Setup" is to dedicate primary colors:
120VAC
Black L1
Blue L2
White L0 (neutral)
12VDC
Red Hot all the time. Not swithed at source
Yellow Battery negative
Remaining Colors: Switched or dedicated fuse circuits
You cannot appreciate how much EASIER this makes things years later. Find a color wire then go to the fuse panel and read the function label.