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What are requirements for a 20 minute fire door rating?

Question asked by Kristen Koehler on May 21, 2018
Latest reply on Jun 1, 2018 by Milton Werner

I am wondering if there is a source for the requirements for a 20 minute fire door? In other words, what makes a 20 minute fire door rated as a fire door - just the slab? Does it need special jambs? Spring hinges? Weatherstripping against smoke? I read section 12.4 of the code but can't find an overview of the actual requirements that make a door fire rated for 20 minutes.

 

Thanks!

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