How to sound proof a pair of s-7 miners.

philipma1957

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Quote from: citronick on November 01, 2015, 02:42:59 AM

saw this old youtube video on "PC Fan Muffler"

https://www.youtube.com/watch?v=-5vvtt_vwgo

My S7s will be outdoors so all I need to keep the noise down.

Will this fan muffler work ? It certainly use all the concepts discussed in this thread but its look so simple without ducting.

won't work it will cut down the fan speed and air flow way too much.

the ducts I use work they are 7 inch and fit the fans easy.

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Quote from: OgNasty on November 01, 2015, 03:15:44 AM

I would be worried about restricting the airflow with something like that.

Definitely WAY too restrictive... There's nothing wrong with the principle behind what they're doing, it's simple: eliminate direct paths for the soundwaves, and replace highly reflective (audible-wise) surfaces with non-reflective ones (ie; foam). I have a huge rack mount case that does much the same thing, but you need to make sure the air channel is at least the same size as the fan, and if you're introducing turns and obstructions then you need more space than that.

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Quote from: citronick on November 01, 2015, 02:42:59 AM

saw this old youtube video on "PC Fan Muffler"

https://www.youtube.com/watch?v=-5vvtt_vwgo

My S7s will be outdoors so all I need to keep the noise down.

Will this fan muffler work ? It certainly use all the concepts discussed in this thread but its look so simple without ducting.

I would be worried about restricting the airflow with something like that.

citronick

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---- winter*juvia -----

saw this old youtube video on "PC Fan Muffler"

https://www.youtube.com/watch?v=-5vvtt_vwgo

My S7s will be outdoors so all I need to keep the noise down.

Will this fan muffler work ? It certainly use all the concepts discussed in this thread but its look so simple without ducting.

philipma1957

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temps dropped to 45f
my heat is turned off
coldest part of the house =74f
the garage is 86f
sound is good----------looking for the meter

good overnight numbers fan at 60% freq at 587

UfoRia

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It would be easier to just buy the right size ductboard and then use egg crates padding.

http://www.certainteed.com/resources/3034015.pdf
http://www.certainteed.com/products/insulation/mechanical-industrial/317382

You can find simple ductboard locally and they make it in squares, which is easier to work with if needed.

I just force vent the exhaust into the garage and have a window mounted attic fan that forces air into the room next to the detached garage. I live in Texas, so we can't seal things up otherwise we wind up with mold.

Ufo

philipma1957

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this 8 inch will fit and is a good price. it is in many stores and may the best choice along with duct tape.

http://www.homedepot.com/p/Master-Flow-8-in-x-25-ft-Insulated-Flexible-Duct-R6-Silver-Jacket-F6IFD8X300/100396936

philipma1957

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Quote from: Mikestang on October 30, 2015, 03:48:30 PM

Quote from: philipma1957 on October 30, 2015, 01:06:59 PM

the wall between the garage doors is a support beam. No can do

Well, actually it's a column, but that's the engineer in me speaking through my OCD.

Quote from: OgNasty on October 30, 2015, 01:52:48 PM

I have 6" non-insulated ducting to exhaust the heat and I'm surprised at the noise reduction. That alone makes a 100% fan quieter than a 65% fan without it. Have you tried a shorter length, like say 10" over the exhaust fan only? I am wondering if that would be enough to make a noticeable difference.

I'm not understanding the physics as to why a 6" long tube on the end makes it any quieter. Do you have dB meter readings to back this up?

the pitch changes with more length and since the air travels further it also exits that tube at a slower speed.

my meter readings on non insulated tubes were about 1db less but a bit pitch difference.

I used 7 inch concrete forms (sonotubes)
I used 7 inch metal duct work.

7 inch tubes fit right over the fan the 7 inch product from homedepot is very good

here is a cheap home depot product - but it is six inches it will not fit right

http://www.homedepot.com/p/Master-Flow-6-in-x-25-ft-Insulated-Flexible-Duct-R6-Silver-Jacket-F6IFD6X300/100396935

here is what I used 7 inch r8

http://www.homedepot.com/p/Thermaflex-EverClean-7-in-x-25-ft-HVAC-Ducting-R8-0519-0700-0003/203767737

big price difference

OgNasty

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Quote from: Mikestang on October 30, 2015, 03:48:30 PM

I'm not understanding the physics as to why a 6" long tube on the end makes it any quieter. Do you have dB meter readings to back this up?

The 6" was diameter. Sorry. It is actually multiple feet long and leads outside, so that is where a majority of the noise is routed. I was just curious if a shorter 7" diameter insulated duct over the exhaust fan would also have a good noise reducing effect. I thought it might.

philipma1957

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I boosted fans to 70% and hash to freq 581.25

now I have a 'good' batch 1 and a 575 marked batch 2

but the 581 numbers with both combined below are decent

Mikestang

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Quote from: philipma1957 on October 30, 2015, 01:06:59 PM

the wall between the garage doors is a support beam. No can do

Well, actually it's a column, but that's the engineer in me speaking through my OCD.

Quote from: OgNasty on October 30, 2015, 01:52:48 PM

I have 6" non-insulated ducting to exhaust the heat and I'm surprised at the noise reduction. That alone makes a 100% fan quieter than a 65% fan without it. Have you tried a shorter length, like say 10" over the exhaust fan only? I am wondering if that would be enough to make a noticeable difference.

I'm not understanding the physics as to why a 6" long tube on the end makes it any quieter. Do you have dB meter readings to back this up?

pj40

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Quote from: OgNasty on October 30, 2015, 01:52:48 PM

I have 6" non-insulated ducting to exhaust the heat and I'm surprised at the noise reduction. That alone makes a 100% fan quieter than a 65% fan without it. Have you tried a shorter length, like say 10" over the exhaust fan only? I am wondering if that would be enough to make a noticeable difference.

Interesting. It may be worth it to invest in some ducting just to lower the noise and non-insulated stuff is way cheaper than the insulated.

philipma1957

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Quote from: OgNasty on October 30, 2015, 01:52:48 PM

I have 6" non-insulated ducting to exhaust the heat and I'm surprised at the noise reduction. That alone makes a 100% fan quieter than a 65% fan without it. Have you tried a shorter length, like say 10" over the exhaust fan only? I am wondering if that would be enough to make a noticeable difference.

I tell you what I have more then 16 ft left I will cut some short ones.

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I have 6" non-insulated ducting to exhaust the heat and I'm surprised at the noise reduction. That alone makes a 100% fan quieter than a 65% fan without it. Have you tried a shorter length, like say 10" over the exhaust fan only? I am wondering if that would be enough to make a noticeable difference.

philipma1957

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Quote from: OgNasty on October 30, 2015, 12:55:16 PM

Perhaps a cheaper alternative?

http://www.amazon.com/Lamborn-Poly-Jacket-Insulated-R-4-2/dp/B00A8P3QBM/ref=sr_1_2?ie=UTF8&qid=1446227384&sr=8-2&keywords=7+inch+insulated+duct

it is r4 vs r8 that is the heat insulating factor but I suspect it will be a sound factor also.

I am going to have left over material I could build some and ship them out I need to see how much it will pack down.

Quote from: citronick on October 30, 2015, 12:52:36 PM

is it wise to install another fan at the other end of the duct/muffler to get as much heat out as possible?

if you make the duct really long yes it may need a helping fan. my ducts are short and I get very good exit pressure.

Quote from: Mikestang on October 30, 2015, 12:03:58 PM

Quote from: philipma1957 on October 30, 2015, 09:02:08 AM

Phil, did you consider cutting out a vent hole low in the wall between garage doors and ducting the exhaust outside? You could put a nice vent cover over the outside and it wouldn't look like anything out of the ordinary, and then all the heat and much of the exhaust noise would be directed outside.

the wall between the garage doors is a support beam. No can do

it is 2400 watts more or less once we get below 50f the heat will be a non-issue.

as for sound it is under 55db at exit point with the fans at 4100 rpm

In the summer I would need to vent, but my power jumps from 10 cents to 17 cents so I can't summer mine.

OgNasty

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Perhaps a cheaper alternative?

http://www.amazon.com/Lamborn-Poly-Jacket-Insulated-R-4-2/dp/B00A8P3QBM/ref=sr_1_2?ie=UTF8&qid=1446227384&sr=8-2&keywords=7+inch+insulated+duct

citronick

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is it wise to install another fan at the other end of the duct/muffler to get as much heat out as possible?

Mikestang

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Quote from: philipma1957 on October 30, 2015, 09:02:08 AM

Phil, did you consider cutting out a vent hole low in the wall between garage doors and ducting the exhaust outside? You could put a nice vent cover over the outside and it wouldn't look like anything out of the ordinary, and then all the heat and much of the exhaust noise would be directed outside.

philipma1957

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Quote from: torepia on October 30, 2015, 09:40:40 AM

Nice work! Are the miners inside the ducts/vents? Or are you using them just for intake/outtake?

duct----miner----duct
duct----miner----duct
^
^
------ audio rack------

has the miners and the psu's

you could do

duct-- miner-- duct

and get good noise drop.

you could do

duct--------- tube with miner ----- duct

tube is four feet cut in 2

so 3 foot duct------- 2 foot tube ( miner inside) --- 3 foot duct.

7 feet long since some of the duct is inside the cardboard tube

I am piggybacking the controller in my setup so I used the audio rack I linked. since my miners are close together.

I may switch to the tube idea and use 2 controllers

torepia

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Nice work! Are the miners inside the ducts/vents? Or are you using them just for intake/outtake?

Topic: How to sound proof a pair of s-7 miners. (Read 4427 times)