A packless silencer is any fan outlet silencer made without any sound-absorbing material. These are useful, for example, in systems that require thorough steam cleaning on a regular basis. In that case, a traditional silencer would soak up the moisture like a sponge and become a breeding ground for bacteria.
BAM adjusted our construction to compensate for the lack of absorbent media and engineered a unit that's a little longer than most silencers, but performs to the same standards. Now, you can keep your system quiet and clean.