Markmax33
Bronze Member
The problem I have is with the following line in NFPA 90A:
5.3.1 Fire-Rated Walls and Partitions.
5.3.1.1* Approved fire dampers shall be provided where air ducts penetrate or terminate at openings in walls or partitions required to have a fire resistance rating of 2 hours or more.
Basically I have an air handling unit serving a corridor with a duct. The corridor has less than a 2-hour wall. My original interpration (I'm an AHJ for the Navy) was that a duct could penetrate and cross through the corridor and serve a room on the other side of the corridor. Reading this line makes me think that a penetration is allowed into the corridor. What if the air handling unit burns up? The duct smoke detector, if required at 2000 CFMs or greater would signal a supervisory or fire alarm signal and smoke would fill the corridor. I could be mixing up a mechanical term.
5.3.1 Fire-Rated Walls and Partitions.
5.3.1.1* Approved fire dampers shall be provided where air ducts penetrate or terminate at openings in walls or partitions required to have a fire resistance rating of 2 hours or more.
Basically I have an air handling unit serving a corridor with a duct. The corridor has less than a 2-hour wall. My original interpration (I'm an AHJ for the Navy) was that a duct could penetrate and cross through the corridor and serve a room on the other side of the corridor. Reading this line makes me think that a penetration is allowed into the corridor. What if the air handling unit burns up? The duct smoke detector, if required at 2000 CFMs or greater would signal a supervisory or fire alarm signal and smoke would fill the corridor. I could be mixing up a mechanical term.