1/3-hour (20 Minute) Doors
Date:Jan 28, 2019
One-third-hour or 20 minute doors are used in one-hour walls. These doors are used for corridor
applications and in other applications where smoke and draft control is a primary concern.
One-third-hour or 20 minute doors are used in one-hour walls. These doors are used for corridor
applications and in other applications where smoke and draft control is a primary concern.
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