Undercutting of 90-minute rated door

Discussion created by nicole.e on Jul 12, 2016
Latest reply on Jul 12, 2016 by psmith

The design team is interested in ventilating a small room by undercutting the door. The door is rated 90-minutes. Is it acceptable to undercut the door 1/2"-3/4" and maintain the fire-rating?


Thank you.