FM200, NFPA 2001, and ducts passing through a room

[Takket3]

Hi,

would motorized dampers to close of a duct be required if a duct is passing through a space that has FM200, but there is NO communication of air between the duct and the space? (Duct serves a completely different area. There are no registers/diffusers of any kind in the FM200 space). There are fire dampers in the duct where it enters and leaves the space because the wall is rated.

Since the duct is enclosed and shares no air, I don't see what difference it would make to install motorized dampers that close when the FM200 is released.

NFPA 2001 says this:

5.3.6* Other than the ventilation systems identified in 5.3.6.2,
forced-air ventilating systems, including self-contained air recirculation systems, shall be shut down or closed automatically where their continued operation would adversely affect the performance of the fire extinguishing system or result in propagation of the fire.

I guess what I'm keying in on is "adversely affect the performance". There is no air coming out of the duct to dilute the FM200, and likewise there is no way for the FM200 to enter the duct to travel to another space, so I see no reason that duct, without5 motorized dampers, can possible adversely affect the performance of the system.

Anyone have any experience with this?

 

[stookeyfpe]

As described, the duct is just passing through the protected space and doesn't communicate into it. A fire/smoke damper isn't required. The only major consideration is the ensure the space around the duct penetrations are adequately sealed to prevent the loss of the gaseous extinguishing agent as well as to successfully complete the room pressurization test, if one is specified.

 

[tcook002]

I have experience with this. You'll be fine unless they want to apply NFPA 75 2009 or 2013. There is wording in there that states "fire and smoke damper" instead of just "fire damper"