Sound Insulation
Sound Insulation
(OP)
Hi
Can some one suggest any non-fibrous insulation material for cold supply air ducts.
Is it true, polyolefin liners have good noise absorption properties as claimed by the manufacturers?
Any industry experience?
Thanks
Can some one suggest any non-fibrous insulation material for cold supply air ducts.
Is it true, polyolefin liners have good noise absorption properties as claimed by the manufacturers?
Any industry experience?
Thanks





RE: Sound Insulation
RE: Sound Insulation
Don't route ducts directly from room to room. Locate the main in the corridor and extend small runouts to each room.
The problem with liners is the fine dust that accumulates on the surface. The liner itself doesn't support microbial growth but the dust layer is a fertile medium for pathological organisms, especially if the humidity is high in the duct. Then when the time comes to clean the duct,the cleaner has to be careful that the cleaning device doesn't chew into the liner.
RE: Sound Insulation
ht
RE: Sound Insulation
Stanlsimon is correct. Silencers are better - assuming that you have the room. Even if you don't, you're better off accepting the noise. As for the other statement, it is better to state it this way:
"... even if the cleaner is careful, the cleaning device will chew into the liner."
Most duct with liner more than a decade old might as well be completely replaced; the decomposition of the material is so bad and pervasive. In advanced stages, whole areas can receive a daily deposit of black particles - because of the liner decomposition. In worse cases, people are actually breathing it.
That doesn't even account for the possible microbial potential. Industries as diverse as heavy industrial to ultra-precision measurement and bio labs have been increasingly banning the practice for the last 20 years.
The Engineering community (ASHRAE?) should take a more proactive stance and ban it alltogether.
RE: Sound Insulation
I accept controlling noise at source or attenuating in Plant room/AHU is the best way to tackle.
and i infer that there is no Non fibrous liner for duct work.
Does any one know, why the Active silencer technology (Microphone-speaker combo) was never succcesful
RE: Sound Insulation
RE: Sound Insulation
Discussion of non-fibrous liner alternatives. They're out there, the VAV box manufacturer's also offer a non-fibrous liner in addition to the foil faced option.
RE: Sound Insulation
RE: Sound Insulation