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Roof top Mech. Screen

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I have been asked to design a screen for roof top mechanical screen.  The
screen is about 4 feet high.  The architect prefers to use tube steel.
My question is about corrosion protection.  Should the exposed steel be
galvanized or just painted with a zinc-rich primer and finish coat?  I
know painting is cheaper.  What is the advantage and disadvantage of

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