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,...
The Von Duprin Guard-X exit device is not fire rated because the deadbolt is not spring loaded. Therefore, there would be no positive latching as required on a fire rated opening.
There are several door manufacturers that have achieved a 90 minute UL Fire listing as shown.
Von Duprin CVC with Marshfield Wood Door: Von Duprin is pleased to announce that Marshfield ...