Ventilation Damping

Tanuvan

Tanuvan

Well-Known Member
Anyone know of a good way to reduce the sound of air "wooshing" out of the ducting?

The actual fan is not very noisy at all. I have seen duct mufflers, but wondered if anyone had any experience with those as well.
 
Tanuvan

Tanuvan

Well-Known Member
Nope, just the regular flimsy stuff. Would the insulated ducting solve the problem? I thought that was for condensation or something.
 
LoudBlunts

LoudBlunts

Well-Known Member
well, ya see....im all about stealth. i NEED to be stealth as possible....

so IMO and with my needs, i will ONLY use insulated ducting to decrease the noise of the air being pushing or pulled thru the ducting.

Majority of the noise is coming from the air traveling in the duct.

i think that most people confuse that noise with them thinking it is the fan making the noise. Quite the contrary in some situations!!!

try using rubber grommets, sitting the fan on sound dampening material as well as hanging the fan with bungee/rubber cords so the material will absorb the vibrations!!!!
 
Bamm Bamm

Bamm Bamm

Well-Known Member
is this the insulated stuff or is there something better?I'd like to make mine quieter as well..

 
Dats

Dats

Well-Known Member
Smooth hard sheetmetal ducting will be quieter than any other type. Also try to avoid sharp turns as they will make the air noise louder. If you must use flexible ducting stretch it out as tight as you can to quiet it down a bit but it will never be as quiet as metal duct work.
 
jimmyspaz

jimmyspaz

Well-Known Member
Yeah isolate the source of vibration as much as possible. I use slices of pool noodle about 1 inch thick under my ballasts to reduce hum. I know this is slightly off topic but related.
 
Bamm Bamm

Bamm Bamm

Well-Known Member
Nice I was just thinking about that hum it annoys the fuck out of my girlfriend at 6 when evetrything kicks on in the closet..Even with the door shut it lights the bedroom up=) I walked in after she woke up and first thing i heard was the powerhouse ballast
 
Tanuvan

Tanuvan

Well-Known Member
Bamm Bamm said:
that stuff looks nice... It's weird because it seems that this would be quieter than the solid ductwork?
Click to expand...
That is the stuff Loud had me get. Now, the results are...


AMAZING!!! Let me find you so I can + rep you Loud.

I did some experiments:

I used the insulated ducting throughout the entire thing. And it was much quieter. (note* we are not talking about the slight hum of the fan. That is different. We are talking about the air noise as it passes through the ductwork)

However, that insulated ducting is a pain in the ass to work with. It has fiberglass so you have to make SURE you have eye, hand, and breathing protection. (I used the lawn masks that cover your nose/mouth) You will be handling it quite a bit so protection is a must, not an option.

I went back to using the regular ducting on everything before the fan (intake side). I then used insulated ducting on everything after the fan, and it is just as quiet (in my setup). So, I am sticking with just using the insulated on the outtake part of the fan.

Like so


carbon filter -> non-insulated -> HPS(cool tube) -> non-insulated -> [inline fan] -> insulated -> exhaust port [greatly reduced air noise here]

All in all, this is stuff may seem pricey at $25 for 25 ft, BUT it is much cheaper than the duct muffler they sell online.

Thanks again Loud!!!:hump:
 
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