Inline fans are vibrating my house!

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fasteddy0

So, just had to revamp the ventilation, as my old fan setup wasn't keeping my temps in check.

I replaced a max 10 attached to a carbon filter with a noise reduction clamp.
This was very quiet and I could not hear anything on the main floor of the house before.

The upgrades have included a new exhaust fan hooked up the exact same way.
Uninsulated Thermoflo 14" (there is no way to insulate with space restricitons) ->Max 14 -> Noise reduction clamp -> Can Lite 14"

I can now hear this hum on the outside of my house, and a for sure on the main floor of the house. I thought the max 14" was supposed to be really quiet!?!?

Now today, I got to work on the new air cooled lighting ventilation project.

I put in a new Max Fan Qmax 12. If you are not familiar this is the new quiet line in the Max Fan lineup. It has built in duct mufflers and sound dampening foam in it, I don't think they are online anywhere yet, but might be able to post pics later if there is interest. I have this hanging from a bungee, and hooked up to uninsulated thermoflo on both sides (once again space restrictions permit insulated)

Now this fan is very LOUD! It is humming on the main floor of my house worse than the 14" max. So here is my question the room is in an unfinished basement and the only thing seperating this basement and the main floor of my house is a wood floors on top of a few layers of sub floor.

I am just wondering if any one has any thoughts on how to quiet these things down... I could potentially build insulated boxes around these fans, but am up for other suggestions.
 
rvd

rvd

So, just had to revamp the ventilation, as my old fan setup wasn't keeping my temps in check.

I replaced a max 10 attached to a carbon filter with a noise reduction clamp.
This was very quiet and I could not hear anything on the main floor of the house before.

The upgrades have included a new exhaust fan hooked up the exact same way.
Uninsulated Thermoflo 14" (there is no way to insulate with space restricitons) ->Max 14 -> Noise reduction clamp -> Can Lite 14"

I can now hear this hum on the outside of my house, and a for sure on the main floor of the house. I thought the max 14" was supposed to be really quiet!?!?

Now today, I got to work on the new air cooled lighting ventilation project.

I put in a new Max Fan Qmax 12. If you are not familiar this is the new quiet line in the Max Fan lineup. It has built in duct mufflers and sound dampening foam in it, I don't think they are online anywhere yet, but might be able to post pics later if there is interest. I have this hanging from a bungee, and hooked up to uninsulated thermoflo on both sides (once again space restrictions permit insulated)

Now this fan is very LOUD! It is humming on the main floor of my house worse than the 14" max. So here is my question the room is in an unfinished basement and the only thing seperating this basement and the main floor of my house is a wood floors on top of a few layers of sub floor.

I am just wondering if any one has any thoughts on how to quiet these things down... I could potentially build insulated boxes around these fans, but am up for other suggestions.
i hang mine by a bungi one way or the other.:)
 
Cort

Cort

Bungis are a great way to dampen the noise. If it must be solid mounted, say to the wood you have blocking your window, try rubber between the solid item and the fan.

Others have used material like dynamat applied to the fan to reduce noise but vibrations seem to be a mounting problem, not a noisy fan problem.
 
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Snowblind

Snowblind

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I just got used to the noise after like 6 months. I was shocked at how loud the fans were back when I started. Ive taken a two by four and cut it to size. Mount the fan to the cut wood. Mount this to the ceiling with bungie cords and hooks. This will reduce vibration.
 
S

StonerB

I agree with all the suggested. Bunjis are the traditional way but coming from a competition car audio background I love the dyna mat. When I worked in a hydro store and suggested it to anyone they usually blew it off as hearsay, im glad more growers are becoming creative in their ways. My only two cents to add would be to make sure you get the dynamat made for underhood applications because it can take the high heat sometimes created by constantly running fans. I learned this mistake the hard way and the black tar type whatever shit melted all over when I used standard dynamat thats made for door panels or low heat spots. Pay more, special order, do whatever you need to but get the thick underhood type, whatever it costs will be cheaper than having to replace a 12 or 14 inch fan because shit is all over it two weeks down the road. Peace and happy growing to all.
 
F

fasteddy0

Thanks everyone. I think I'm gonna start with a duct muffler then dynamat if needed.
 
ttystikk

ttystikk

Another often overlooked source of noise is the way your fan is being operated; if it's on a speed controller, aka 'dimmer switch', then that is likely to cause a loud buzz or humming noise that will not be dampened by bungee cords or other vibrsation isolation techniques.
 
Haggardass

Haggardass

i just bought those little brass hooks and i screwed 2x4s into the ceiling then screwed the hooks in and then i took some speaker wire laying around the house and tied knots then fed it through the screw holes in the mounting bracket on the fan then tied it to the hooks the difference was amazing. i didnt read your post just the title so if im not even on the right problem your having i apologize lol
 
D

Dungbudd

5
3
Hey.Not sure if I missed this somewhere(i've been looking hard before asking)lol. I get all the fan noise stuff but if I use a 8, 10 without a speed control pulling through a 6" inlet will the 6" whistle per-say?If I am a jackass for not finding this on here, sorry
 
Cort

Cort

Dung, it could. Thats lot of air to push thru a small hole. I dont know how effective a duct muffler would be on a whistle caused by restrictions.

My suggestion, if you need an 8 inch fan, you need 8 inch ducting. Same goes for 10.
 
Haggardass

Haggardass

Dung, it could. Thats lot of air to push thru a small hole. I dont know how effective a duct muffler would be on a whistle caused by restrictions.

My suggestion, if you need an 8 inch fan, you need 8 inch ducting. Same goes for 10.

I agree any ducting smaller then the circumference of the fan is just counter productive.
 
D

Dungbudd

5
3
Thanks guys..I need to push through 6 600w hoods,but being how my house is built I will have to restrict it to 6" for air in a sealed room. I think I'll go with the big fan and use a speed control to find a happy medium and try to make the best of it. Maybe I can make a larger filter box at the inlet that can muffle some noise
 
B

biggs

i had the very same problem bro, i've built myself a mdf wooden box lined with celotex boards. used insulated ducting and a silencer. theres no hum or any noise now, seriously quiet.
 
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