Having done audio engineering work my suggestion for your demos is to not hold the measuring tool in the path of the air flow because unless the “muffled” vent also decreases airflow you’ll be pushing/pulling the same amount of air past the microphone which creates a ton of wind. In normal day use we stand about 2-5 feet away from the opening of the vent as so that would be the best way to test the effect - get in a small room where the motor is in another room and have the vent end up in that small room and then place the measuring tool about where a persons head would end up in relation to the vent. Even without all that I’m just saying that airflow has its own noise that happens regardless of motor noise (think of how noisy the wind in the air can be and it’s not like we are hearing some giant turbine off in the distance that’s causing all the noisy wind). It also has to do with pressure and other factors (of which you are decreasing with your demo) but I think the biggest showstopper you could demonstrate would be to do a very long section of muffled venting vs traditional and have people hear the difference when you switch some kind of y-joint near the fan.
@@Kevin-sd9ec holly ish you took the words right out of my mouth he has to be onsomething I am on something also my point is if you take a piece of metal and you put cloth around it it's going to be quiet whether it has holes in it or notput a t-shirt on something glass or metal and hit it it's a lot quieter basic physics Bud good video though and as far as what knucklehead was getting into it will get quieter if you hold it further away but we want to see the difference not go to the extremes how do I can see his point also it seems to be slightly misplaced
@@toolguyslayer1 But he was measuring at the opening of the duct. The insulation would only help for the radial noise, probably not much for the axial transmission. I have my bathroom vent motor in another room (further more, on the other side of the next room) and yet I can still hear the fan through the duct like it was one inch from my ear. If I put insulation on the duct in the next room it would make no difference in how much noise I could hear in the bathroom. I hope that makes sense. I wish I could draw a diagram.
the silencers are not effective, because I used x2, two silencers, one at each mouth entrance and low from 77db to 69 db my rvk200 of 1080m3, some Spanish brand sonoconnect soundproof ducts lowered me to 70.5 db, using 70cm on each side, Well, the silenced duct has a value of 3.80 euros per meter, cheap but the silencer, the silencer duct in my case of 60cm and 200mm is worth 200mm is worth a minimum of 50 euros, for 60cm of silencer, which has 4cm of low absorbent material class, 25kg wool or other low density per kg per m2 and density at a thickness of 40 millimeters 4 cm of wool, the silencers are the biggest expense less performance, now disappointed with the result of the silencers that I buy confident in 20 to 28 Result db I will desistalare them and buy spending more than one for bad information and deception because they are useless, the change is noticeable 4%, a modern conduit of the latest design, it is French it is called phonic trap, I am sure that replacing my s traditional rock wool and aluminum sonoconnect ducts for this phonic fabric with cotton that is just as effective as wool plus the polyethylene layer will have better results than with silencers and the obsolete technology of traditional aluminum soundproof tubes plus rock wool plus aluminum Micro perforated, as I will trust the phonic trap brand, I found a virgin brand phonic trap from France that looks good, in my country Spain Madrid, we only have silencers that do not give good results and obsolete aluminum pipes plus rock wool Simple, thank God I found modern French ducts which I have not used or tested but I trust, my idea is to use my size of 20cm to which I am going to micro-perforate and the outer layer to add rock wool of construction of 40kg and 5cm more thick to add to the tube that thanks to the metal structures does not obstruct, then the 20cm tube has a total of 24 I stick 5cm good rock wool and have go 29cm I will add 1cm of acoustic membrane for low frequencies of 2mm and then a total of 30cm I will put another 31 cm conduit inside unmodified phonic trap, in plan an outer layer that protects, total a tube for a 200 extractor with a conduit of 315, but 115mm of absorbent layers
We put the a vapor barrier around the metal duct to make it air tight again. Then we add insulation and another vapor barrier. This was designed for hospital patient rooms so they wouldn't be bothered by the air conditioner coming on. This also makes inline quiet fans obsolete
Are there any differences between perforated insulated duct and perforated insulated duct with vapor barrier? I see your comments that you put vapor barrier on it, but did you see any result differences? Which one should have better result?
Strange video. As David Swanson so aptly stated, you don't put a mic in front of wind when measuring noise no matter what kind of wind filter it has and this one surely didn't have much. 2 other problems I noticed: They didn't even try to seal the duct to the noise generator. Who knows how much noise was leaking out if the gaps? Also they should have also measured each duct with it curving at least once. Maybe even twice. Most ducts are not completely straight and this greatly aids in noise reduction.
What do you do if the duct can't be replaced? (The ceiling would have to be torn open, as there's no attic, and the landlord would be unlikely to agree to that.) Have you ever tried interior lining?
@@AR-tb9hq Thanks. That silver interior lining, is it the one that's: (1) around 3/16" soft butyl rubber with a sheet of aluminum on one side and peel-and-stick self-adhesive on the other side? (2) just a fairly thin-gauge round metal tube with tiny holes drilled specially for acoustic damping, as in your video? (3) 1/2" high-tech fibrous padding between coating on both sides, which you cut, bend into a tube shape, and put inside the duct? I appreciate your reply. I turn on the fan and it sounds like the end of the world. (But if I take out the fan itself, hold it in my hand and turn it on, it's whisper-quiet.😂)
Please contact me at jeff@cobre29.com. The internal diameter for this duct is 4.08 " . Diameters available from 4" to 16" ID. Duct is UL rated for 4,000 FPM
the silencers are not effective, because I used x2, two silencers, one at each mouth entrance and low from 77db to 69 db my rvk200 of 1080m3, some Spanish brand sonoconnect soundproof ducts lowered me to 70.5 db, using 70cm on each side, Well, the silenced duct has a value of 3.80 euros per meter, cheap but the silencer, the silencer duct in my case of 60cm and 200mm is worth 200mm is worth a minimum of 50 euros, for 60cm of silencer, which has 4cm of low absorbent material class, 25kg wool or other low density per kg per m2 and density at a thickness of 40 millimeters 4 cm of wool, the silencers are the biggest expense less performance, now disappointed with the result of the silencers that I buy confident in 20 to 28 Result db I will desistalare them and buy spending more than one for bad information and deception because they are useless, the change is noticeable 4%, a modern conduit of the latest design, it is French it is called phonic trap, I am sure that replacing my s traditional rock wool and aluminum sonoconnect ducts for this phonic fabric with cotton that is just as effective as wool plus the polyethylene layer will have better results than with silencers and the obsolete technology of traditional aluminum soundproof tubes plus rock wool plus aluminum Micro perforated, as I will trust the phonic trap brand, I found a virgin brand phonic trap from France that looks good, in my country Spain Madrid, we only have silencers that do not give good results and obsolete aluminum pipes plus rock wool Simple, thank God I found modern French ducts which I have not used or tested but I trust, my idea is to use my size of 20cm to which I am going to micro-perforate and the outer layer to add rock wool of construction of 40kg and 5cm more thick to add to the tube that thanks to the metal structures does not obstruct, then the 20cm tube has a total of 24 I stick 5cm good rock wool and have go 29cm I will add 1cm of acoustic membrane for low frequencies of 2mm and then a total of 30cm I will put another 31 cm conduit inside unmodified phonic trap, in plan an outer layer that protects, total a tube for a 200 extractor with a conduit of 315, but 115mm of absorbent layers
Having done audio engineering work my suggestion for your demos is to not hold the measuring tool in the path of the air flow because unless the “muffled” vent also decreases airflow you’ll be pushing/pulling the same amount of air past the microphone which creates a ton of wind. In normal day use we stand about 2-5 feet away from the opening of the vent as so that would be the best way to test the effect - get in a small room where the motor is in another room and have the vent end up in that small room and then place the measuring tool about where a persons head would end up in relation to the vent. Even without all that I’m just saying that airflow has its own noise that happens regardless of motor noise (think of how noisy the wind in the air can be and it’s not like we are hearing some giant turbine off in the distance that’s causing all the noisy wind). It also has to do with pressure and other factors (of which you are decreasing with your demo) but I think the biggest showstopper you could demonstrate would be to do a very long section of muffled venting vs traditional and have people hear the difference when you switch some kind of y-joint near the fan.
Being a person with common sense my question to them is: are you drunk?
@@Kevin-sd9ec holly ish you took the words right out of my mouth he has to be onsomething I am on something also my point is if you take a piece of metal and you put cloth around it it's going to be quiet whether it has holes in it or notput a t-shirt on something glass or metal and hit it it's a lot quieter basic physics Bud good video though and as far as what knucklehead was getting into it will get quieter if you hold it further away but we want to see the difference not go to the extremes how do I can see his point also it seems to be slightly misplaced
@@toolguyslayer1 But he was measuring at the opening of the duct. The insulation would only help for the radial noise, probably not much for the axial transmission. I have my bathroom vent motor in another room (further more, on the other side of the next room) and yet I can still hear the fan through the duct like it was one inch from my ear. If I put insulation on the duct in the next room it would make no difference in how much noise I could hear in the bathroom. I hope that makes sense. I wish I could draw a diagram.
the silencers are not effective, because I used x2, two silencers, one at each mouth entrance and low from 77db to 69 db my rvk200 of 1080m3, some Spanish brand sonoconnect soundproof ducts lowered me to 70.5 db, using 70cm on each side, Well, the silenced duct has a value of 3.80 euros per meter, cheap but the silencer, the silencer duct in my case of 60cm and 200mm is worth 200mm is worth a minimum of 50 euros, for 60cm of silencer, which has 4cm of low absorbent material class, 25kg wool or other low density per kg per m2 and density at a thickness of 40 millimeters 4 cm of wool, the silencers are the biggest expense less performance, now disappointed with the result of the silencers that I buy confident in 20 to 28 Result db I will desistalare them and buy spending more than one for bad information and deception because they are useless, the change is noticeable 4%, a modern conduit of the latest design, it is French it is called phonic trap, I am sure that replacing my s traditional rock wool and aluminum sonoconnect ducts for this phonic fabric with cotton that is just as effective as wool plus the polyethylene layer will have better results than with silencers and the obsolete technology of traditional aluminum soundproof tubes plus rock wool plus aluminum Micro perforated, as I will trust the phonic trap brand, I found a virgin brand phonic trap from France that looks good, in my country Spain Madrid, we only have silencers that do not give good results and obsolete aluminum pipes plus rock wool Simple, thank God I found modern French ducts which I have not used or tested but I trust, my idea is to use my size of 20cm to which I am going to micro-perforate and the outer layer to add rock wool of construction of 40kg and 5cm more thick to add to the tube that thanks to the metal structures does not obstruct, then the 20cm tube has a total of 24 I stick 5cm good rock wool and have go 29cm I will add 1cm of acoustic membrane for low frequencies of 2mm and then a total of 30cm I will put another 31 cm conduit inside unmodified phonic trap, in plan an outer layer that protects, total a tube for a 200 extractor with a conduit of 315, but 115mm of absorbent layers
ruclips.net/video/MTXSXL1P374/видео.html
O
We put the a vapor barrier around the metal duct to make it air tight again. Then we add insulation and another vapor barrier. This was designed for hospital patient rooms so they wouldn't be bothered by the air conditioner coming on. This also makes inline quiet fans obsolete
ruclips.net/video/MTXSXL1P374/видео.html
O
Are there any differences between perforated insulated duct and perforated insulated duct with vapor barrier? I see your comments that you put vapor barrier on it, but did you see any result differences? Which one should have better result?
Strange video. As David Swanson so aptly stated, you don't put a mic in front of wind when measuring noise no matter what kind of wind filter it has and this one surely didn't have much. 2 other problems I noticed: They didn't even try to seal the duct to the noise generator. Who knows how much noise was leaking out if the gaps? Also they should have also measured each duct with it curving at least once. Maybe even twice. Most ducts are not completely straight and this greatly aids in noise reduction.
ruclips.net/video/MTXSXL1P374/видео.html
O
I would like to have seen a demo of the uninsulated piece of the duct with the holes in it.
Mark, Do you want to see the test with the vapor barrier only? I can do that if you want. Please let me know.
Wouldn't air leak out??
ruclips.net/video/MTXSXL1P374/видео.html
O
So are these still being sold? Where?
So the outer diameter is what and the inner diameter is what? Would have been interesting to include CFM's in the measurements.
Everything is based on internal diameter. I can make duct anywhere from 3" to 20" any other questions jeff@cobre29.com. Thanks
ruclips.net/video/MTXSXL1P374/видео.html
O
What do you do if the duct can't be replaced? (The ceiling would have to be torn open, as there's no attic, and the landlord would be unlikely to agree to that.) Have you ever tried interior lining?
I tried that silver interior lining, it works! but you got to put it at least three feet into the duct
@@AR-tb9hq Thanks. That silver interior lining, is it the one that's:
(1) around 3/16" soft butyl rubber with a sheet of aluminum on one side and peel-and-stick self-adhesive on the other side?
(2) just a fairly thin-gauge round metal tube with tiny holes drilled specially for acoustic damping, as in your video?
(3) 1/2" high-tech fibrous padding between coating on both sides, which you cut, bend into a tube shape, and put inside the duct?
I appreciate your reply. I turn on the fan and it sounds like the end of the world. (But if I take out the fan itself, hold it in my hand and turn it on, it's whisper-quiet.😂)
its quieter but now you're paying to cool the insulation
I put a vapor barrier around the duct and then I insulate it with another vapor barrier around the insulation
ruclips.net/video/MTXSXL1P374/видео.html
O
Is there any way to cool the hot air that exits?
ruclips.net/video/FS2YaJkkHQY/видео.html Bottles of frozen water is less messy.
ruclips.net/video/MTXSXL1P374/видео.html
O
Hi there, what kind of ducting is this? (I wanna purchase one)
ruclips.net/video/MTXSXL1P374/видео.html
O
You’ll never beat phonic trap ducting it’s miles ahead of the game
How can I purchase the insulated acoustical ducting you created? Also, what's the cost. I'm very interested using it in my home. Thanks
ruclips.net/video/MTXSXL1P374/видео.html
O
Snazzy sandals .
I live in wpb, florida. No snow
ruclips.net/video/MTXSXL1P374/видео.html
O
you just need more insulation, problem solved
ruclips.net/video/MTXSXL1P374/видео.html
O
Please contact me at jeff@cobre29.com. The internal diameter for this duct is 4.08 " . Diameters available from 4" to 16" ID. Duct is UL rated for 4,000 FPM
the silencers are not effective, because I used x2, two silencers, one at each mouth entrance and low from 77db to 69 db my rvk200 of 1080m3, some Spanish brand sonoconnect soundproof ducts lowered me to 70.5 db, using 70cm on each side, Well, the silenced duct has a value of 3.80 euros per meter, cheap but the silencer, the silencer duct in my case of 60cm and 200mm is worth 200mm is worth a minimum of 50 euros, for 60cm of silencer, which has 4cm of low absorbent material class, 25kg wool or other low density per kg per m2 and density at a thickness of 40 millimeters 4 cm of wool, the silencers are the biggest expense less performance, now disappointed with the result of the silencers that I buy confident in 20 to 28 Result db I will desistalare them and buy spending more than one for bad information and deception because they are useless, the change is noticeable 4%, a modern conduit of the latest design, it is French it is called phonic trap, I am sure that replacing my s traditional rock wool and aluminum sonoconnect ducts for this phonic fabric with cotton that is just as effective as wool plus the polyethylene layer will have better results than with silencers and the obsolete technology of traditional aluminum soundproof tubes plus rock wool plus aluminum Micro perforated, as I will trust the phonic trap brand, I found a virgin brand phonic trap from France that looks good, in my country Spain Madrid, we only have silencers that do not give good results and obsolete aluminum pipes plus rock wool Simple, thank God I found modern French ducts which I have not used or tested but I trust, my idea is to use my size of 20cm to which I am going to micro-perforate and the outer layer to add rock wool of construction of 40kg and 5cm more thick to add to the tube that thanks to the metal structures does not obstruct, then the 20cm tube has a total of 24 I stick 5cm good rock wool and have go 29cm I will add 1cm of acoustic membrane for low frequencies of 2mm and then a total of 30cm I will put another 31 cm conduit inside unmodified phonic trap, in plan an outer layer that protects, total a tube for a 200 extractor with a conduit of 315, but 115mm of absorbent layers
ruclips.net/video/MTXSXL1P374/видео.html
O
If you want to contact me about this please email me at jeff@cobre29.com
Ok action lol🤣🤣🤣🤣🤣
ruclips.net/video/MTXSXL1P374/видео.html
O