The Von Duprin 1609 cannot be used on a pair of fire rated doors. We recommend using the Von Duprin fire rated mortise exit device in lieu of the rim device such as the Von Duprin 5575-F,...
There are two main differences:The bottom latches are differentThe Von Duprin 98/9947 concealed vertical rod device covers up to 1/4" undercutThe Von Duprin 98/9948 concealed vertical rod device co...
A thumbpiece, knob or lever trim left in the unlock position would be locked when the Chexit is armed and unlock when the Chexit device is disarmed. To keep the outside trim in the lock p...