I removed an old central vac, and installed the new one in a new location where it just vents into the garage, rather than outdoors, so I wanted it to be as quiet as possible when in use. I got this muffler for that purpose. It works much better than the OEM muffler that I got for our last house's central vac, and helps to make it rather quiet across most of the sound spectrum. Now, about all I can hear from it, even when nearby, is a low-intensity high-frequency sound; all of the lower-frequency range, which was very prevalent in the old vac and our previous house's vac, is well muffled. Inside the house, all that we can hear now is the whoosh of the air at the inlet or hose end, whereas before, when the old vac was in a space adjacent to the garage, we could easily hear the vacuum running while inside of the house. Much better!
Rating:
[5 of 5 Stars!]