2-hour fire rated wall rating

[anbm]

If generator room has louvers on some wall portions, how to maintain/meet 2-hour fire rated wall rating requirement at louver portion?

 

[gadfly56]

If generator room has louvers on some wall portions, how to maintain/meet 2-hour fire rated wall rating requirement at louver portion?

Install a 2-hour rated fire damper in the wall and install the louver inboard of the fire damper.

 

[infinity]

That's the way that we do it. Room is typically built with concrete block and fire rated dampers. We've had large walls that were almost entirely intake dampers.