The 20 minute Fire Rating is a valid label and are commonly referred to as "Smoke and Draft control door assemblies". Depending on the local fire code and the openings's application, these doors can be specified as either with or without a hose stream test.
Gaskets: Smoke and Draft control door Assemblies must include the appropriate Fire/Smoke Rated Seals.
20 minute fire doors are installed into one-hour corridor walls where smoke and draft control is required.
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