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the walls are not fire rated for some spaces but other spaces (having a with similar situation of ducts crossing the walls and protected by FM200)have fire rated walls so i have the 2 options :D thanks

Hello everyone! Several type of ducts are passing in the ceiling of a room protected by FM200 system as follow: 1-Supply duct to the space 2-Return duct to the space 3-Fresh air duct to the space 4-Exhaust air duct to the space 5-A series of ducts that are crossing the protected room walls...