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Need help with fan noise reduction
- Thread starter clowntown
- Start date
clowntown: My 6" Fantech FX6 wasn't too loud running @ half speed on a controller. Only difference is I had 1 1/8" of sound deadening plywood the cabinets were made of. It's more the "woosh" of air you're worrying about yes?
I think the whooosh is coming from the intake. That whooosh noise may be higher in my configuration since the motor is right next to the intake hole rather than some length of ducting separating it. Maybe a combination of insulated (and where possible straight) ducting and a sound insulation box built for the fan?
Damn this is a lot of work!
Damn this is a lot of work!
on overgrow i was reading how ppl would either hang the fans with a bungee cord or mount the fan on a 1/2inch thinck rubber gasket. 1/2 inch thick rubber isnt hard to come by most truck mats that keep rocks from being throwen work nice just cut the patteren needed. also insulated ducting helps to keep the wooshn noise to a bear minumim
hazeywonder
Member
I hang mine with Bungee's like Maj. said. which is 2 x 8" elicents. But before I had them on rubber mats then in to the studs. But it would vibrate the wall. Now i just use 2 eye hooks and hang them, it works amazing; soo quite.
Maj.PotHead said:
That's mainly used for unbalanced squirrel cage fans. Most inlines are balanced so well that there's very little gain in doing this. I've got my 8" elicent screwed directly to studs and it's not the fan that makes the noise...just the air flow.
CT - use insulated ducting (or rigid metal duct) and if possible use slightly larger ducting. If you're using the cheap foil/flexible ducting, it's gonna be noisy simply from all the rough surfaces that the air is passing over. The smoother the inside of the ducting (and the larger) the quieter the air flow will be. Also removing any unnecessary bends/reductions in the air flow will help as well.
I hung a 3' chunk of 8" insulated duct on my exhaust (elicent 8") and it dramatically lowered the noise vs. having the fan at the end of the run.
The scrubber will also help, so get that installed ASAP.
Thanks all for the reponses.
For now I will get the scrubber on the intake side and use insulated rigid ducting where possible. As soon as I get the second HydroHut set up I will exhaust out the window with the duct muffler. I need to use some amount of flexible "dryer hose" ducting for me to be able to raise and lower my lights.
For now I will get the scrubber on the intake side and use insulated rigid ducting where possible. As soon as I get the second HydroHut set up I will exhaust out the window with the duct muffler. I need to use some amount of flexible "dryer hose" ducting for me to be able to raise and lower my lights.
thescissors
Member
emulate a straight-thru performance muffler for a car, and the WHOOSH will disappear! been there, done that... 
G
Guest
thescissors said:emulate a straight-thru performance muffler for a car, and the WHOOSH will disappear! been there, done that...
You are saying that packing the inside of a duct with foam will rid us of the "woosh" noise created by the air from the fan? If you have tried this, and it ACTUALLY reduces the "woosh"(not the mechanical noise from the actual fan), than this idea needs it's own thread. A simple 1,2,3 step thread would be great.
Many people have problems with the noise from the airflow, and a solution to the problem is needed. Help the newbs! lol
Thumbs up if it's true
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G
Guest
i made duct mufflers
and wrapped the fan around in insulation
cant hear shit
got a 600cmf vortex
and wrapped the fan around in insulation
cant hear shit
got a 600cmf vortex
2buds
Active member
Try using convoluted eggshell foam, the stuff you put on the mattress to make it softer. I used to wrap my bedroom in the shit to deaden sound. The craters catch sound and absorb it. Worked great! The fluffy side of pink/yellow wall insulation will also deaden sound plus it fiberglass and doesn't absorb moisture.
I'm spoiled and sound doesn't matter in my grow but I run an 8" inline canfan that has about 24' of duct on the exhaust side and the intake comes through a carbon filter, you hear it run but it ain't no louder than a central heat and air system running. It's a recirculating system pulling fresh carbonated air form a central chamber blowing into 3 rooms which vent back to the central chamber. Making your intake taper from say a 12" opening lined with foam/insulation gradually to a 6" or 4" over a 4-6' run will help rid that inrush of air sound since the air will gain momentum and become compressed farther into the duct. Hope something gives you some ideas of your own.
Peace
I'm spoiled and sound doesn't matter in my grow but I run an 8" inline canfan that has about 24' of duct on the exhaust side and the intake comes through a carbon filter, you hear it run but it ain't no louder than a central heat and air system running. It's a recirculating system pulling fresh carbonated air form a central chamber blowing into 3 rooms which vent back to the central chamber. Making your intake taper from say a 12" opening lined with foam/insulation gradually to a 6" or 4" over a 4-6' run will help rid that inrush of air sound since the air will gain momentum and become compressed farther into the duct. Hope something gives you some ideas of your own.
Peace
SacredBreh
Member
Hi clown and all......
Hi clown and all......
I hang the fan also with bungee cords. Thin 1/4 in ones but only so many that the cords only stretch about half way. Then over the space between the fan and the exhaust duct I use the insulated flexible ducting.( 8in or larger) All my ducting is the insulated flexible type. They use to only sell the black plastic but now it is silver reflective type. The scrubber definitely quiets it down. I had the same whooshing on the intake so I also ran a length of flexible, insulated ducting away from the intake of the fan. I tape over the edges of the ducting so the fiberglass edges are covered and contained. I also use some of the same insulation from some of the ducting to wrap the fan. It really cuts down on the whine of the motor. Difficult to hear right in the room. It is a high output can fan on a dimmer for speed. Outside of room absolutely no transfer of noise.
Peace
Hi clown and all......
I hang the fan also with bungee cords. Thin 1/4 in ones but only so many that the cords only stretch about half way. Then over the space between the fan and the exhaust duct I use the insulated flexible ducting.( 8in or larger) All my ducting is the insulated flexible type. They use to only sell the black plastic but now it is silver reflective type. The scrubber definitely quiets it down. I had the same whooshing on the intake so I also ran a length of flexible, insulated ducting away from the intake of the fan. I tape over the edges of the ducting so the fiberglass edges are covered and contained. I also use some of the same insulation from some of the ducting to wrap the fan. It really cuts down on the whine of the motor. Difficult to hear right in the room. It is a high output can fan on a dimmer for speed. Outside of room absolutely no transfer of noise.
Peace
thescissors
Member
YES!!! IT IS TRUE!!!!!!!!!
YES!!! IT IS TRUE!!!!!!!!!
the output on my blower is about 3x7", and it outputs into a box that is about 8x11 (i think), so i just filled the extra area AROUND the 3x7 duct area (kind of continuing the duct) with foam, as you can see in the picture. in current configuration, the end is blocked off and i made a 90-deg bend with foam, which blows into my massive 9"x40" carbon scrubber which sits vertically just below that box on the back of my cabinet. i oversized everything because i planned on running 800w in 5sq. ft. (yes 160w/sqft works! other than the power bills, i cut it down to 400w).
hope this helps!!
YES!!! IT IS TRUE!!!!!!!!!
~Ninja~ said:You are saying that packing the inside of a duct with foam will rid us of the "woosh" noise created by the air from the fan? If you have tried this, and it ACTUALLY reduces the "woosh"(not the mechanical noise from the actual fan), than this idea needs it's own thread. A simple 1,2,3 step thread would be great.
Many people have problems with the noise from the airflow, and a solution to the problem is needed. Help the newbs! lol
Thumbs up if it's true
the output on my blower is about 3x7", and it outputs into a box that is about 8x11 (i think), so i just filled the extra area AROUND the 3x7 duct area (kind of continuing the duct) with foam, as you can see in the picture. in current configuration, the end is blocked off and i made a 90-deg bend with foam, which blows into my massive 9"x40" carbon scrubber which sits vertically just below that box on the back of my cabinet. i oversized everything because i planned on running 800w in 5sq. ft. (yes 160w/sqft works! other than the power bills, i cut it down to 400w).
hope this helps!!
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G
Guest
That is a great post, scissors san....but.....does it actually work to eliminate the "woosh" we all seek to rid ourselves of?
thescissors
Member
~Ninja~ said:
YES!!
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