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Yes in bedrooms.

Edit: Oh wait, you're specifically asking about the combo part right? THAT I'm not positive about.. far as I understood it, only 1 had to be carbon monoxide.. but all have to be battery backup. I always do combos though.. never pushed it before.
 

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I don't think so.. doing so is just going above and beyond minimum code. It's not a bad idea, but if it's not specified in code rules, then I won't be doing it.

The smokes detect smoke.. the CO's detect CO and the combos just happen to do both in one unit in the same location.
 
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