Another noob question, this one about my new fan

M

macbuds1983

Member
Hey all

I just picked up a new 4in inline fan and its a little nosier then I had hoped. I have been thinking of ways to make it quieter and wanted to run a couple things past the pros.

1. I dont have a speed controller yet but plan on buying one asap. If my fan is supposedly 46db at full blast and I turn it down to half will it become half as loud?

2. Can i build a sound proof box around the fan or is that a bad idea?

3. Another option is to mount the fan in the attic above the grow, to do this I might have to make 3 90* turns with the duct work between the fan and the scrubber and one more 90* to go outside. Is this going to stress the fan? I have spent many years working as a plumber and when I plumb in a sump/septic pump I try to keep it under 360* of turns in the discharge pipe so I dont stress the pump. I cant see there being as much pressure in the air line as a water line but what do I know, I am new.

Thanks

MBuds
 
navyfighter04

navyfighter04

Active Member
macbuds1983 said:
Hey all

I just picked up a new 4in inline fan and its a little nosier then I had hoped. I have been thinking of ways to make it quieter and wanted to run a couple things past the pros.

1. I dont have a speed controller yet but plan on buying one asap. If my fan is supposedly 46db at full blast and I turn it down to half will it become half as loud?

2. Can i build a sound proof box around the fan or is that a bad idea?

3. Another option is to mount the fan in the attic above the grow, to do this I might have to make 3 90* turns with the duct work between the fan and the scrubber and one more 90* to go outside. Is this going to stress the fan? I have spent many years working as a plumber and when I plumb in a sump/septic pump I try to keep it under 360* of turns in the discharge pipe so I dont stress the pump. I cant see there being as much pressure in the air line as a water line but what do I know, I am new.

Thanks

MBuds
Click to expand...
How many CFM is your fan? Turning the fan down half way wont necessarily reduce the decibels by half.....
 
Papa Toke

Papa Toke

Active Member
Hey dude,

1. I dont have a speed controller on mine either, but my room is sound proof. And with the fan spinning slower it will create less noise yes, but probably not as much as you would like.

2. I was thinking about doing this myself for my clone room (Not sound proof). Thought it was a pretty cool idea and cant see why it wouldnt work.

3. Thats alot of 90's, iirc each 90 takes 20-30% away from the cfm, but im not 100% on those numbers. Be sure to get another opinion on this one.
 
BeaverHuntr

BeaverHuntr

Well-Known Member
Speed Controller will help with noise? Yes it will help somewhat

Building a box around your fan will help with noise? Yes it will

Noisy fans are just part of the game.. You can look for a inline fan muffler on ebay if you are that serious about reducing the noise.
 
Turm

Turm

Active Member
Get a duct muffler and insulated ducting. Then make a makeshift box like i did (honestly didn't help much)and all that together with a speed controller will make it pretty quiet.
 
dannyboy602

dannyboy602

Well-Known Member
4" in line fans don't pull that much air. i like the mufler idea. mb make it out of something that is thick like foam. idk. look in home depot. but don't block the air flow
 
N

NORML

Well-Known Member
You need to attach the fan to something or surround the fan with material that ABSORBs sound. Foam, Blankets, Wool, Insulation, etc. Make sure the fan ISNT attached to something wood or metal as this will resonate the vibrations.
 
B

bseeds

Well-Known Member
go to home depot get a 1 inch 4by 8 insalate foam board they use fore duct work are foil on it cut to lenght you want figure out your width and hieght then add together cut board where you want your corners to meet w/h cut v in foam board but not all the way through bend to make perfect corners only need one seam to tape then cut end pieces but holes in for ducting remember to put it on ceiling first then screw fan to ceiling threw it then form your box and tape it add end pieices with holes tape it hook up ducting your done nice neat job also could you thicker foam board
 
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