Sounds like a leer jet is in my closet, advice for noise reduction

sizzlasia · #1 (**permalink**) 08-26-2007, 09:27 AM

Since I got my 400 all hooked up and my 265 whisper fan, my closet is loud as anything. Im running the metal ducting etc and its so loud its unbearable.. the fan motor istself is quiet just the air moving through the ducts im assuming is making the noise. I searched and read something about egg crates.. any ideas would be great. I read mixed reviews about dimmers and thats not looking like an option

OldSkool1010 · #2 (**permalink**) 08-26-2007, 02:37 PM

It's just a wild assed idea, but what about insulating the ducts? A roll of that fiberglass and foil duct insulation might dampen the noise. Also, try isolating the source of the noise. I'm thinking that the point where the fan meets the duct would be a big noise maker, transferring vibrations and such to the duct where it kind of amplifies. I don't know how big of a duct you're using, but can you rig some sort of coupling between the fan and duct that wouldn't transfer sound?

where is this venting?

sizzlasia · #3 (**permalink**) 08-26-2007, 05:28 PM

Its a 6 inch, so right now I have 6 inch alluminum ducting.. and yeah I hear you maybe I should go get one of those neoprene duct fittings.. the box is in my closet and the duct is running to the side wehre there is nothing

sizzlasia · #4 (**permalink**) 08-27-2007, 06:20 PM

Good call, I got the ducting and there is virtually no sound coming out of the duct, but the area where the fan is still transmits alot of noise out the box. Any ideas?

Newblicious · #5 (**permalink**) 08-28-2007, 02:07 AM

you can use rubber washers to minimize bounce from the fan.

other than that you need to insulate it, make sure everything fits well, and turn the t.v up when someone is in the rooms around the grow

sizzlasia · #6 (**permalink**) 08-28-2007, 02:24 AM

The fan is mounted on 1/4 inch door sealing stuff.. how do I insulate it for sound? The ducting is insulated and shut the noise up 100% on that end of things.. now theres still a decent bit of noise coming from the fan area

OldSkool1010 · #7 (**permalink**) 08-30-2007, 01:38 AM

I'm glad that insulating the ductwork muffled the noise. Did you isolate the fan from the duct? Is that where the fan is making the noise, or is it securely fastened to the box/wall etc. with screws? The weather stripping sounds like it should prevent the fan from vibrating against the box. Can't tell from this end, you'll just have to listen until you find where the noise is coming from.

Quote:

Originally Posted by sizzlasia

The fan is mounted on 1/4 inch door sealing stuff.. how do I insulate it for sound? The ducting is insulated and shut the noise up 100% on that end of things.. now theres still a decent bit of noise coming from the fan area

mordgrow · #8 (**permalink**) 08-30-2007, 02:15 AM

once i got my dimmer and suspended my fan by bungie cords (not screwd to anything solid) my shits been perfect. except at the exit point where it blows really strong, flatens all the grass for a foot or two infront of it!

normaly i leave it cranked full on, its a lil noisy then,but quieter than normal "house sounds" so its not a big deal, but i can turn it down to damn near silent, still keep my room vented, just not as cool.(cool keeps the smell down a lot, i like 75-78 degrees) i'd be comfortable leaving it that way for a week or two if i had to.

and if its quiet again, no ones over etc.. i'll just crank it back on full. I also lined the floor of the grow room with foil buble insulation, and the door is sealed with foil buble ins. with a ziper opening behind the door opening, haha makes it totaly light/smell proof and helps a ton with sound.

sizzlasia · #9 (**permalink**) 08-30-2007, 08:22 AM

Quote:

Originally Posted by OldSkool1010

I'm glad that insulating the ductwork muffled the noise. Did you isolate the fan from the duct? Is that where the fan is making the noise, or is it securely fastened to the box/wall etc. with screws? The weather stripping sounds like it should prevent the fan from vibrating against the box. Can't tell from this end, you'll just have to listen until you find where the noise is coming from.

Yup.. Its screwed into the roof of the box with weather stripping in between.. but there still noise coming from that area.. would like to silence it completely if i could

Quote:

once i got my dimmer and suspended my fan by bungie cords (not screwd to anything solid) my shits been perfect. except at the exit point where it blows really strong, flatens all the grass for a foot or two infront of it!

normaly i leave it cranked full on, its a lil noisy then,but quieter than normal "house sounds" so its not a big deal, but i can turn it down to damn near silent, still keep my room vented, just not as cool.(cool keeps the smell down a lot, i like 75-78 degrees) i'd be comfortable leaving it that way for a week or two if i had to.

and if its quiet again, no ones over etc.. i'll just crank it back on full. I also lined the floor of the grow room with foil buble insulation, and the door is sealed with foil buble ins. with a ziper opening behind the door opening, haha makes it totaly light/smell proof and helps a ton with sound.

Well the way I have things setup thats not really an option because I have a "whisper fan" (check out www.sunshinehydro.com) mounted to the roof of my box with glass about 3 inches below that.

What is foil bubble insulation and where'd you get that?

hydro · #10 (**permalink**) 09-03-2007, 12:07 PM

air restriction could be causing the noise. remove the duct from the hood completely and open the doors so the air is totally unrestricted and see if its still loud, if not re pipe the duct. but you may need some metal duct, the flexible kind will make noise due to the material. the ridges that make it flexible act as a turbulator and the length of the run will dictate sound tone. you want smooth duct like used for heating systems.

keylime · #11 (**permalink**) 09-03-2007, 04:10 PM

If you use a dimmer switch on your fan, you are damaging your fan and its also dangerous. Dimmer switches are not meant for fans!

Mister Postman · #12 (**permalink**) 09-03-2007, 04:55 PM

Quote:

Originally Posted by keylime

If you use a dimmer switch on your fan, you are damaging your fan and its also dangerous. Dimmer switches are not meant for fans!

Yeah regular dimmer switches you'd use for lights are not good for heavy duty exhaust fans like we use...

What you'd need is a "solid state speed control" not for dimming lighting, or ceiling fans, but for pole style/heavy duty inline exhaust fans as we use.. Most on the market are speed controllable with the proper speed controller.. No humming, no nothing when you got the right dimmer/speed controller hooked up.. My fan goes from silent to leer jet with a twist of the dial.

http://www.icmag.com/gallery/data/500/11783IMG_0046.jpg

OldSkool1010 · #13 (**permalink**) 09-04-2007, 08:05 PM

Good call on the air restriction. My fan makes more noise when I have some of the intakes closed off.

He is using aluminum ducting; when he wrapped it in insulation that dropped a lot of the noise, but it sounds like the fan is humming and it is being resonated by the mounting.

Quote:

Originally Posted by hydro

air restriction could be causing the noise. remove the duct from the hood completely and open the doors so the air is totally unrestricted and see if its still loud, if not re pipe the duct. but you may need some metal duct, the flexible kind will make noise due to the material. the ridges that make it flexible act as a turbulator and the length of the run will dictate sound tone. you want smooth duct like used for heating systems.

hydro · #14 (**permalink**) 09-04-2007, 10:49 PM

there is aluminum flexible and aluminum hard duct. the flexible aluminum duct has ridges on the inside - no good for systems w/ forced air.

sizzlasia · #15 (**permalink**) 09-04-2007, 11:08 PM

Quote:

Originally Posted by OldSkool1010

Good call on the air restriction. My fan makes more noise when I have some of the intakes closed off.

He is using aluminum ducting; when he wrapped it in insulation that dropped a lot of the noise, but it sounds like the fan is humming and it is being resonated by the mounting.

Bingo.. the heating style insulated ducting killed the noise from the end of the duct, its just where the fan is mounted itself seems to be making noise

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#1 (permalink) 08-26-2007, 09:27 AM
sizzlasia Registered User Join Date: May 2007 Posts: 273	Sounds like a leer jet is in my closet, advice for noise reduction Since I got my 400 all hooked up and my 265 whisper fan, my closet is loud as anything. Im running the metal ducting etc and its so loud its unbearable.. the fan motor istself is quiet just the air moving through the ducts im assuming is making the noise. I searched and read something about egg crates.. any ideas would be great. I read mixed reviews about dimmers and thats not looking like an option

#2 (permalink) 08-26-2007, 02:37 PM
OldSkool1010 Registered Gardener Join Date: Jul 2007 Location: Florida Posts: 2,393	It's just a wild assed idea, but what about insulating the ducts? A roll of that fiberglass and foil duct insulation might dampen the noise. Also, try isolating the source of the noise. I'm thinking that the point where the fan meets the duct would be a big noise maker, transferring vibrations and such to the duct where it kind of amplifies. I don't know how big of a duct you're using, but can you rig some sort of coupling between the fan and duct that wouldn't transfer sound? where is this venting?

#3 (permalink) 08-26-2007, 05:28 PM
sizzlasia Registered User Join Date: May 2007 Posts: 273	Its a 6 inch, so right now I have 6 inch alluminum ducting.. and yeah I hear you maybe I should go get one of those neoprene duct fittings.. the box is in my closet and the duct is running to the side wehre there is nothing

#4 (permalink) 08-27-2007, 06:20 PM
sizzlasia Registered User Join Date: May 2007 Posts: 273	Good call, I got the ducting and there is virtually no sound coming out of the duct, but the area where the fan is still transmits alot of noise out the box. Any ideas?

#5 (permalink) 08-28-2007, 02:07 AM
Newblicious Registered User Join Date: Jan 2007 Posts: 51	you can use rubber washers to minimize bounce from the fan. other than that you need to insulate it, make sure everything fits well, and turn the t.v up when someone is in the rooms around the grow

#6 (permalink) 08-28-2007, 02:24 AM
sizzlasia Registered User Join Date: May 2007 Posts: 273	The fan is mounted on 1/4 inch door sealing stuff.. how do I insulate it for sound? The ducting is insulated and shut the noise up 100% on that end of things.. now theres still a decent bit of noise coming from the fan area

#8 (permalink) 08-30-2007, 02:15 AM
mordgrow BUSTED Join Date: Jan 2007 Location: BUSTED Posts: 1,557	once i got my dimmer and suspended my fan by bungie cords (not screwd to anything solid) my shits been perfect. except at the exit point where it blows really strong, flatens all the grass for a foot or two infront of it! normaly i leave it cranked full on, its a lil noisy then,but quieter than normal "house sounds" so its not a big deal, but i can turn it down to damn near silent, still keep my room vented, just not as cool.(cool keeps the smell down a lot, i like 75-78 degrees) i'd be comfortable leaving it that way for a week or two if i had to. and if its quiet again, no ones over etc.. i'll just crank it back on full. I also lined the floor of the grow room with foil buble insulation, and the door is sealed with foil buble ins. with a ziper opening behind the door opening, haha makes it totaly light/smell proof and helps a ton with sound. __________________ I got busted because I didnt have a good filter. DONT MAKE THE SAME MISTAKE

#10 (permalink) 09-03-2007, 12:07 PM
hydro Banned Join Date: Jan 2003 Posts: 111	air restriction could be causing the noise. remove the duct from the hood completely and open the doors so the air is totally unrestricted and see if its still loud, if not re pipe the duct. but you may need some metal duct, the flexible kind will make noise due to the material. the ridges that make it flexible act as a turbulator and the length of the run will dictate sound tone. you want smooth duct like used for heating systems. Last edited by hydro; 09-03-2007 at 12:45 PM. Reason: stoned

#11 (permalink) 09-03-2007, 04:10 PM
keylime Registered User Join Date: Aug 2007 Posts: 142	If you use a dimmer switch on your fan, you are damaging your fan and its also dangerous. Dimmer switches are not meant for fans!

#14 (permalink) 09-04-2007, 10:49 PM
hydro Banned Join Date: Jan 2003 Posts: 111	there is aluminum flexible and aluminum hard duct. the flexible aluminum duct has ridges on the inside - no good for systems w/ forced air.

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