I find my Oasis system to be loud so adding a muffler

[John Boy]

Thank you so much for thinking of your neighbors (as well as yourself).
Those babies are loud, even a few spaces away.

Originally Posted by Vickie 4369

So first thing I noticed was the Oasis furnace can be pretty loud.

It simply has a nice 2 inch exhaust pipe but no muffler, I inquired about this with IRT and they stated that Newmar used to install mufflers and didn't know they don't anymore.

I installed there optional Inlet muffler ( as simple PVC pipe with Foam inside) which helps some but nowhere as much as this does on the exhaust side.

https://www.summitracing.com/parts/j...iABEgLUD_D_BwE

I have tested this back to back by simply slipping this over the tailpipe and it does a great job of knocking down the noise

I will be installing this plus a nice stainless turn down tip and stainless clamps and hangers not a fan of the U clamps

Moving to the Rod weld on with rubber isolators.

Ted.

[Calpop45]

Nice, 10 Fan! Where did you get the nifty hanger that you installed at the muffler outlet?

[10 fan]

Originally Posted by Vickie 4369

I see you have a mud dauber screen on your oasis air inlet.

Care to elaborate your Ideas or problems you had.

I covered everything underneath to make sure nothing could get in.

[10 fan]

Originally Posted by Calpop45

Nice, 10 Fan! Where did you get the nifty hanger that you installed at the muffler outlet?

When I raised and rerouted the exhaust I removed 2 hangers and used the one in the picture. I turned the muffler clamp sideways.

[dpfreeman]

Please post photos of your fix

[Grandparacer]

Get an app on your iPhone for DB testing. If I recall it is free.

[tnedator]

Originally Posted by Vickie 4369

A 5 dB reduction is pretty significant, as I understand it Each dB number is multiplied 10 fold sound level on the way up.

Here is a good Article on the subject. https://science.howstuffworks.com/qu...udible%20sound.

Ted.

Sound doubles every three DB of increase. So, 57 is twice as loud as 54, 57-60 would be doubled again, so at 59, not quite doubled.

So, going the other direction, presumably, you cut the sound in half almost twice. 5 DB is significant.

A bigger issue with the Oasis isn't so much the DB, 59 is actually pretty quiet as many homes have a noise floor in the low 50s just from lights, fans, ACs, etc., but instead the fact it's a fairly deep bass heavy sound. Low frequency bass travels further and passes through more walls, hence the reason you hear the annoying thump, thump, thump of some punk driving down the road, but not the actual music.

So, unless the muffler significantly reduces the amount of low frequency, I'm not sure how much relief it's going to be to neighbors (something I worry about with mine).

[Vickie 4369]

Originally Posted by tnedator

Sound doubles every three DB of increase. So, 57 is twice as loud as 54, 57-60 would be doubled again, so at 59, not quite doubled.

So, going the other direction, presumably, you cut the sound in half almost twice. 5 DB is significant.

A bigger issue with the Oasis isn't so much the DB, 59 is actually pretty quiet as many homes have a noise floor in the low 50s just from lights, fans, ACs, etc., but instead the fact it's a fairly deep bass heavy sound. Low frequency bass travels further and passes through more walls, hence the reason you hear the annoying thump, thump, thump of some punk driving down the road, but not the actual music.

So, unless the muffler significantly reduces the amount of low frequency, I'm not sure how much relief it's going to be to neighbors (something I worry about with mine).

As I explained in a previous post, my coach is parked in my driveway about 40 feet from the house, My bedroom sits 1 floor above with no window on the driveway side.

Before the muffler It would wake me every time it kicked on (someone said 747 warming up agree) now I don't even here it unless I am awake and the house is very quiet.

It made a significant difference for me and I could not be happier.

Ted.

[Chesuncook 1]

Hi everyone, I have read the entire post and wondering if anyone knows if the Aqua Hot is as loud? I have 2018 Tiffin Bus and it doesn't seem very loud but I don't want to annoy my neighbors. We are going to a rally and I bought two exhaust kits to vent Aqua Hot and genny above the roof. Haven't installed them yet. Appreciate any advice. Thanks

[Vickie 4369]

Originally Posted by Chesuncook 1

Hi everyone, I have read the entire post and wondering if anyone knows if the Aqua Hot is as loud? I have 2018 Tiffin Bus and it doesn't seem very loud but I don't want to annoy my neighbors. We are going to a rally and I bought two exhaust kits to vent Aqua Hot and genny above the roof. Haven't installed them yet. Appreciate any advice. Thanks

I imagine the noise level is similar, you can get a free dB meter app on your phone and check yours and compare it to the gentlemen's readings above.

If you are adding Genturis then that will also help redirect the noise up rather than out.

Ted.

[sturgisguy]

I've been wanting to quite down my Onan generator on our Bounder for some time now, will these work for that?

[Dutch Star Don]

I've never paid attention to the sound level of an Aqua Hot, but I have noticed that you smell the diesel more. I'm not being critical as it's a good product, but Oasis advertises that theirs is odorless, which I find to be true.

The Aqua Hots that I've looked at have been bigger and I believe all in one units. For that reason they may suppress sound better.

[Airizon]

Originally Posted by 10 fan

FLSteve
I went to the app store on my phone and searched db meters. I will post pictures today. I went to the link posted (first one) and after measuring there was room for the 18" muffler, 24" overall. It was $5 less than the 12". I called Jones after Ted posted the correct link and was told the resonator is a glass pack with nothing to where out, less restriction but not as quiet as the turbo muffler. The restriction won't matter with such a small output. It is a 1/2" larger, 4" instead of 3.5". Last year I raised it 3" so I'm still ahead of the game.

Ted
Your right about the db curve, I forgot about that. Thanks for posting this, maybe my friends will stop asking me if I'm warming up my 747.

Thanks from your friends

[osuallen]

Originally Posted by tnedator

Sound doubles every three DB of increase. So, 57 is twice as loud as 54, 57-60 would be doubled again, so at 59, not quite doubled.

Actually, sound power doubles every 10 db (db is a logarithmic scale). 3 db is a perceptible difference in sound level to the human ear.