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suspended MAU registers within a suspended ceiling grid

Since you are in CA and probably a seismic zone "D" I would think ASCE 7 would apply

2021 IMC
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2021 IBC
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Non Structural Components would include HVAC systems
 
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Make Up Air unit

The acronym for that would be MUA. I did an Internet search for "MUA Register" and all that came back was things like links to Mauritius, or to registration for some conference in Las Vegas.

General rant: As a chronic curmudgeon, I hate it when people make up acronyms without defining them, and I have to say that this forum is where I see it more than anywhere else in the real world or the cyber world.
 
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