Won't make your HP quiet, but will significantly reduce the noise level of the exhaust, and the harshness of the sound.

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!

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!

It was extremely easy to attach and it muffled the noise of the exhaust very well. Highly recommended

It was extremely easy to attach and it muffled the noise of the exhaust very well. Highly recommended

Our central vac was so loud it would drive animals away and no one could be in the area outside. After installation the only sound that was present was the exhaust air itself!

Our central vac was so loud it would drive animals away and no one could be in the area outside. After installation the only sound that was present was the exhaust air itself!

This is why i got it, it does not cut down on the loudness from the vacuum produced from the cannister inside the house, but rather the high pitched jet sound leaving from the house from the 2 PVC air vent, and that is a welcome event...that loudness was unacceptable...

This is why i got it, it does not cut down on the loudness from the vacuum produced from the cannister inside the house, but rather the high pitched jet sound leaving from the house from the 2 PVC air vent, and that is a welcome event...that loudness was unacceptable...

Second inline muffler on exterior exhaust. Quiets exhaust enough that my neighbor not longer complains.

Second inline muffler on exterior exhaust. Quiets exhaust enough that my neighbor not longer complains.

Works great. Installed easily to the central vacs outlet tube. Cut noise from 80db to 70db. I'm not exactly sure how the db scale works but that 10db reduction makes a huge difference in my backyard where the central vac outlet goes.

Works great. Installed easily to the central vacs outlet tube. Cut noise from 80db to 70db. I'm not exactly sure how the db scale works but that 10db reduction makes a huge difference in my backyard where the central vac outlet goes.

I got this item thinking it wouldn't help much. I mean... it's a tube full of foam. Boy howdy, was I wrong.I have a crappy bucket head shop vac in a 12'x12' room, and the thing must be nearing infinity decibels. I thought it was the unit as a whole being loud, but upon closer inspection, It has a few main volume sources:- The top heat vent ( pretty loud )- The output hose ( holy wow, it hurts the ears )- Sound emanating through the body and bucket ( minor )This thing doesn't even fit my vacuum, but even if I hang it off the end like a size 16 shoe on a child, the sound on the output hose still drops to nearly zero. It's so quiet I can't even hear it over the heat vent.I handled the rest with a cardboard box padded with dense soundproofing foam, but then I put cedar 1/4 paneling on the box, so balances out, on the fancy meter.tl;drIt works reeeally gud, on the output hose, which is the loudest thing. Just make sure that you identify if there are multiple sound sources, and tackle them separately.

I got this item thinking it wouldn't help much. I mean... it's a tube full of foam. Boy howdy, was I wrong.I have a crappy bucket head shop vac in a 12'x12' room, and the thing must be nearing infinity decibels. I thought it was the unit as a whole being loud, but upon closer inspection, It has a few main volume sources:- The top heat vent ( pretty loud )- The output hose ( holy wow, it hurts the ears )- Sound emanating through the body and bucket ( minor )This thing doesn't even fit my vacuum, but even if I hang it off the end like a size 16 shoe on a child, the sound on the output hose still drops to nearly zero. It's so quiet I can't even hear it over the heat vent.I handled the rest with a cardboard box padded with dense soundproofing foam, but then I put cedar 1/4 paneling on the box, so balances out, on the fancy meter.tl;drIt works reeeally gud, on the output hose, which is the loudest thing. Just make sure that you identify if there are multiple sound sources, and tackle them separately.

I love the fact the high pitch whine is gone.

I found this muffler to be well made and effective. For my application, I have noticed(or not noticed as it were) a significant reduction in the noise levels of our system. The openings were uniform and provided a tight fit. A pleasant transaction and a fine product.

Works like a charm. I think a few people misunderstand what it is used for. If you are standing next to your central vacuum it only reduces a small amount. If you listen to the exhaust that pipes outside of the house you will notice a huge difference. I do recommend getting additional pipe to make modifications unless you want to go through the struggle of rigging it like I did.

Made a big difference! Very impressed, worked much better than expected. Before the vac could be heard located in the basement. Now can barely hear it and now can't hear it with the tv on. Imagine using two of them! Lol. All it is, is a foam lined piece of tubing.