Stealth exhaust

Frosty78

Habitabat autem somnium
I thought id put this here for fellow growers that are in the same boat. I bought an 8 inch inline extraction fan and although happy with the volume of air it can move i wasn't happy with the noise and decided to do something about it instead of having prying eyes do me a mischief. In Other countries on this beautiful planet they allow you to grow, over here....not so much, so we do things to mitigate the chances of getting pinched by the armed militia masquerading as nice guys.

I will be purchasing a very quiet top of the line fan in the not to distant future, however It was time to make lemonade from lemons.

I will run you though what I did, and how it worked for me
Could it be quieter? Yes? Could I make it quieter ? Yes
However it's at the point that it is quiet enough that unless you know what you're listening for it will pass the test of prying eyes, rippers and snitches.

I first decided to muffle the inline fan so I bought acoustic foam from online. Thought while I'm at it may as well make a muffler too.
Came in a package of pieces of 30cm x 30cmx5cm thick.
I decided to reuse the inline filter cardboard box for muffling/silencing the fan and the carbon filter box for the exhaust muffler/silencer. Both worked a treat.

Fan muffler
20221007_111237.jpg
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I made a template from the foam protection at the end of the carbon filter. Perfect dimension. I reused the polystyrene on both ends. Fitted the other end after putting in acoustic foam pieces. I slit the corner of one side of the cardboard box for the power lead from the fan to get through. I then sticky taped it back together and made sure inline fan foam was back in place.

Next I used occy straps to hold it into place. These you can adjust to suit hook into bottom of cardboard to get some purchase and hook to your overhead poles in your tent.



20221007_114458.jpg

Next I hooked up a little length offcut of insulated ducting to the carbon filter.
20221007_161908.jpg

Now for the exhaust muffler/silencer.
I used the carbon filter box. Used the foam protectors at the ends which doubled as a template. Cut out both ends. I then used art craft glue to stick the acoustic panels internally to the box. I let it dry for 24 hours the hung in. I put a little bit of acoustic ducting coming off the fan just to make sure I had a seal and fed it in. Hung it with occy straps and tied it back onto fan for a tight seal. I then fed the acoustic ducting length into outlet point of muffler. Remember I made two ends. Feed it in (it's quite tight to push in both ends. The acoustic makes it snug) then obviously the other end has gone out of the tent outlet.
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Now the fan runs around 1/3 quieter and.the air coming out is baffled somewhat. I could probably add more foam and rewrap it again and quieten further. I still have foam left, maybe something I revisit on the weekend.
All about ironing out kinks and streamlining so you are happy. Either way foam coast me $50. I had occy straps and cardboard left over. Glue I borrowed from my kids craft box.

In summary,
I have thought it wise to purchase a top of the range fan like ac infinity. But when you haven't got the dollars at the time it makes no cents. Make do with what you have to get you by. Macgyver things and save for when you're flyin like Neville bartos. Then you can splurge.
 

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Sugar Pops420

Poppin’ Beans
I thought id put this here for fellow growers that are in the same boat. I bought an 8 inch inline extraction fan and although happy with the volume of air it can move i wasn't happy with the noise and decided to do something about it instead of having prying eyes do me a mischief. In Other countries on this beautiful planet they allow you to grow, over here....not so much, so we do things to mitigate the chances of getting pinched by the armed militia masquerading as nice guys.

I will be purchasing a very quiet top of the line fan in the not to distant future, however It was time to make lemonade from lemons.

I will run you though what I did, and how it worked for me
Could it be quieter? Yes? Could I make it quieter ? Yes
However it's at the point that it is quiet enough that unless you know what you're listening for it will pass the test of prying eyes, rippers and snitches.

I first decided to muffle the inline fan so I bought acoustic foam from online. Thought while I'm at it may as well make a muffler too.
Came in a package of pieces of 30cm x 30cmx5cm thick.
I decided to reuse the inline filter cardboard box for muffling/silencing the fan and the carbon filter box for the exhaust muffler/silencer. Both worked a treat.

Fan muffler
View attachment 138829
View attachment 138827
I made a template from the foam protection at the end of the carbon filter. Perfect dimension. I reused the polystyrene on both ends. Fitted the other end after putting in acoustic foam pieces. I slit the corner of one side of the cardboard box for the power lead from the fan to get through. I then sticky taped it back together and made sure inline fan foam was back in place.

Next I used occy straps to hold it into place. These you can adjust to suit hook into bottom of cardboard to get some purchase and hook to your overhead poles in your tent.



View attachment 138830

Next I hooked up a little length offcut of insulated ducting to the carbon filter.
View attachment 138832

Now for the exhaust muffler/silencer.
I used the carbon filter box. Used the foam protectors at the ends which doubled as a template. Cut out both ends. I then used art craft glue to stick the acoustic panels internally to the box. I let it dry for 24 hours the hung in. I put a little bit of acoustic ducting coming off the fan just to make sure I had a seal and fed it in. Hung it with occy straps and tied it back onto fan for a tight seal. I then fed the acoustic ducting length into outlet point of muffler. Remember I made two ends. Feed it in (it's quite tight to push in both ends. The acoustic makes it snug) then obviously the other end has gone out of the tent outlet.
View attachment 138840
View attachment 138841

Now the fan runs around 1/3 quieter and.the air coming out is baffled somewhat. I could probably add more foam and rewrap it again and quieten further. I still have foam left, maybe something I revisit on the weekend.
All about ironing out kinks and streamlining so you are happy. Either way foam coast me $50. I had occy straps and cardboard left over. Glue I borrowed from my kids craft box.

In summary,
I have thought it wise to purchase a top of the range fan like ac infinity. But when you haven't got the dollars at the time it makes no cents. Make do with what you have to get you by. Macgyver things and save for when you're flyin like Neville bartos. Then you can splurge.
Just a question,
Have you tried the foam the other way around? (Points going outwards) I’m thinking like acoustic board or sound board..
the surface isn’t flat or smooth, as to catch the (sound)waves easier.. Just a thought..
 

Frosty78

Habitabat autem somnium
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G'day @Sugar Pops420 I've installed it the way recommended. I believe the triangles or bubbles with other types of acoustic sound are made that way to disrupt and bounce the sound while absorbing. So it would catch some while bouncing off and them catching. Sort of like a pinball machine I guess.

I'm not sure how you'd stick the point and feel comfortable they wouldn't fly off the side of the muffler from the velocity of airflow discharged at rear of fan.
Around the fan I could reverse it no worries. It's always a work in progress. At this stage I'm happy where it's at to get through flower stage. After that I can easily dismantle (hence the occy straps for rapid assemble dismantle and they help dampen vibrations too) I will then clean room out and revisit it. There is a myriad of things I want to change and alter. When I can get it running like clockwork on every level I'll be happy. This has been a good test run. The sound in the room has dropped quite considerably so I'm happier.....
 

Sugar Pops420

Poppin’ Beans
View attachment 138951
View attachment 138952

G'day @Sugar Pops420 I've installed it the way recommended. I believe the triangles or bubbles with other types of acoustic sound are made that way to disrupt and bounce the sound while absorbing. So it would catch some while bouncing off and them catching. Sort of like a pinball machine I guess.

I'm not sure how you'd stick the point and feel comfortable they wouldn't fly off the side of the muffler from the velocity of airflow discharged at rear of fan.
Around the fan I could reverse it no worries. It's always a work in progress. At this stage I'm happy where it's at to get through flower stage. After that I can easily dismantle (hence the occy straps for rapid assemble dismantle and they help dampen vibrations too) I will then clean room out and revisit it. There is a myriad of things I want to change and alter. When I can get it running like clockwork on every level I'll be happy. This has been a good test run. The sound in the room has dropped quite considerably so I'm happier.....
Happy and safe are what counts bro! Was just a thought I had pondered and thought I’d bring it to light.. ??
 

Frosty78

Habitabat autem somnium
Happy and safe are what counts bro! Was just a thought I had pondered and thought I’d bring it to light.. ??
That's it mate. I'm no Oracle. That's how we elevate. Bounce ideas off each other. I will definitely try it next time. I'll see if I can scrounge an el cheapo dB meter. Will be able to gauge difference if I there's not much I can tell by ear. Just cause I macgyver things doesn't mean I don't like to test them.
"Yeah science"
Jesse pinkman world renowned macgyver chemist lol
 

Frosty78

Habitabat autem somnium
Hey brother , hope you guys are all ok with the deluge of rain coming through . I see VIC is copping flooding as well . The Murry is leaking all over the place
Yeah mate we are ok. They were sandbagging in town around substations shop fronts etc for the river expected to peak tomorrow I think. More rain Thursday Friday I think. Kinder I'd cancelled atm, school main road under water the other day. The news loves this shit. Scaring people. I'm old enough to know it's happened before many times and worse. We are safe so I'm happy. Farm I'm heading out to later this week to tend to the horses and check over fences etc. It's always wetter out that way. If the river does rise and peak as they predict it might be an issue and I'll get my neighbour to pop in and check on the horses. Pretty lucky where my farm is. One road into dead end. My neighbours all shoot foxes and keep an eye on the joint while I build. I look at everything in life is a test of your character.
You guys over there would've got smashed before us. Tv news is all melb vic centric so it has to be atleast as bad as here.
Stay safe mate
 

PlumberSoCal

? Guy Fire-y ?
I thought id put this here for fellow growers that are in the same boat. I bought an 8 inch inline extraction fan and although happy with the volume of air it can move i wasn't happy with the noise and decided to do something about it instead of having prying eyes do me a mischief. In Other countries on this beautiful planet they allow you to grow, over here....not so much, so we do things to mitigate the chances of getting pinched by the armed militia masquerading as nice guys.

I will be purchasing a very quiet top of the line fan in the not to distant future, however It was time to make lemonade from lemons.

I will run you though what I did, and how it worked for me
Could it be quieter? Yes? Could I make it quieter ? Yes
However it's at the point that it is quiet enough that unless you know what you're listening for it will pass the test of prying eyes, rippers and snitches.

I first decided to muffle the inline fan so I bought acoustic foam from online. Thought while I'm at it may as well make a muffler too.
Came in a package of pieces of 30cm x 30cmx5cm thick.
I decided to reuse the inline filter cardboard box for muffling/silencing the fan and the carbon filter box for the exhaust muffler/silencer. Both worked a treat.

Fan muffler
View attachment 138829
View attachment 138827
I made a template from the foam protection at the end of the carbon filter. Perfect dimension. I reused the polystyrene on both ends. Fitted the other end after putting in acoustic foam pieces. I slit the corner of one side of the cardboard box for the power lead from the fan to get through. I then sticky taped it back together and made sure inline fan foam was back in place.

Next I used occy straps to hold it into place. These you can adjust to suit hook into bottom of cardboard to get some purchase and hook to your overhead poles in your tent.



View attachment 138830

Next I hooked up a little length offcut of insulated ducting to the carbon filter.
View attachment 138832

Now for the exhaust muffler/silencer.
I used the carbon filter box. Used the foam protectors at the ends which doubled as a template. Cut out both ends. I then used art craft glue to stick the acoustic panels internally to the box. I let it dry for 24 hours the hung in. I put a little bit of acoustic ducting coming off the fan just to make sure I had a seal and fed it in. Hung it with occy straps and tied it back onto fan for a tight seal. I then fed the acoustic ducting length into outlet point of muffler. Remember I made two ends. Feed it in (it's quite tight to push in both ends. The acoustic makes it snug) then obviously the other end has gone out of the tent outlet.
View attachment 138840
View attachment 138841

Now the fan runs around 1/3 quieter and.the air coming out is baffled somewhat. I could probably add more foam and rewrap it again and quieten further. I still have foam left, maybe something I revisit on the weekend.
All about ironing out kinks and streamlining so you are happy. Either way foam coast me $50. I had occy straps and cardboard left over. Glue I borrowed from my kids craft box.

In summary,
I have thought it wise to purchase a top of the range fan like ac infinity. But when you haven't got the dollars at the time it makes no cents. Make do with what you have to get you by. Macgyver things and save for when you're flyin like Neville bartos. Then you can splurge.
There'd be less noise if you were wearing cross. Just sayin?
 

UncleB

☀️🌵💨💨💨
Staff member
Moderator
I'm thinking autocorrect got the best of you @PlumberSoCal

praying hail mary GIF



=


Fashion Shopping GIF by Couponmoto
 

Frosty78

Habitabat autem somnium
I'm thinking autocorrect got the best of you @PlumberSoCal

praying hail mary GIF



=


Fashion Shopping GIF by Couponmoto
I'm glad you caught it. I know I mangle the keys on the keyboard and and autocorrelation takes over. See did it there. Auto correct not autocorrelation lol
Now can old mate @PlumberSoCal enlighten me with what you were trying to express. I bastardise the English language very well. What were you trying to say champ?
 

PlumberSoCal

? Guy Fire-y ?
I'm glad you caught it. I know I mangle the keys on the keyboard and and autocorrelation takes over. See did it there. Auto correct not autocorrelation lol
Now can old mate @PlumberSoCal enlighten me with what you were trying to express. I bastardise the English language very well. What were you trying to say champ?
I was trying to be funny. I make fun of crocs and own a pair?
 
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