I'm posting this because if this subject ever is an issue with you
(which probably includes about 90% of the American population), you
really owe it to yourself to read my thread "OT? Humongous traverse
drapery rod won't close."
ColbyT, a professional, answered just about every question you could
possibly have about where to place rods, safety measures to consider,
making pull cords knot-free, etc.
Ten years on the Internet, and this thread's my all-time keeper.