How to determine whether a fire door is normally open or normally closed?
Thread Content
1. Is it based on the volume of traffic? But how much traffic is allowed to pass through when it’s open, and how much when it’s closed? 2. Can this be determined from the fire safety design drawings? If possible, could you provide a picture?
For those that are frequently used, set them to normally open. If few people pass by usually, set it to normally closed. It seems there is no specific figure for the number of users.
A fire door that has only a door closer behind it is normally closed; one that has both a door closer and a release mechanism behind it is normally open. Generally, they are designed to be normally closed, and having a release mechanism that requires synchronization with the fire control room is quite complicated