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Grill in a 20 minute rated door?

It depends, back in the day we often created tunnel corridors vs extending corridor studs to the underside of the deck above. Area above rated corridor was then used as part of return air plenum before ducted return air.
 
Not an IBC person

But it is only a two story building

Maybe if someone would post you a code reference as what is required to be rated.
 
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