1/3-hour (20 Minute) Doors

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.


Previous: Twenty-minute Doors Tested Without Hose Stream

Next: 3/4-hour (45 Minute) Doors