How to make primary and secondary silencers of large generators... Tell me in detail... It must be p

In addition to the noise reduction treatment on the walls and top of the computer room itself, it is best to use the computer room door as a porch, which also serves for sound insulation and noise reduction. with two soundproof doors, plus a soundproofing channel, as secondary soundproofing, in the evacuation. The air outlet is made of an "impedance composite soundproof cover". If the air inlet is in the porch, then two soundproof covers are also made. called secondary silencers. The generator exhaust pipe is wrapped, and two mufflers are connected in series, which is also a secondary muffler. Let me explain in detail how to do this