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i dont think it matters? differnet types of slotted are cut both ways, and on their website they have pictures with the slots going both ways. Doesnt mention anything about Left or Right side specific that I can see. Where did you read that at?
I just re-learned something. It doesn't matter which direction the external slots are pointed. The rotors are installed so the the internal vanes are sucking air from the center of the rotor, not scooping it in as they turn. In most cases the external slots are pointed in the opposite direction as yours, but either way is acceptable.