There are 4 types of fire door locks. 1. Fireproof lock: there are lock body, lock cylinder, fireproof handle and key. 2. Fire passage lock: generally use the passage of the stairwell. 3. Tube well lock: used for fire doors in shafts and tube wells. 4. Push rod lock: If there is an escape channel, if you need to escape, an escape lock should be installed. You can consult us about the functional characteristics of fire door locks.