I live in a 3rd floor apartment, and I'm going to vent out a window that is about 20ft vertically and 20ft horizontally from a heavily trafficked walkway. I just bought a Can 8" HO 735cfm fan with a Can 75 filter. I haven't mounted them or run a ducting yet, but I turned it on just to hear it. Man, its pretty loud. I know I can reduce the noise with bungees and insulated ducting, and I really like that mounting box, but I'm worried about the sound of the airflow itself tipping people off. Does anyone have a similar sized setup? What does it sound like when you are outside in the vicinity of the vent? Should I get a muffler? I asked the owner of the hydro shop for one, but he said I didn't need it, even though he had them in stock. I figured he wouldn't pass on selling it to me unless I really didn't need it. Would a muffler reduce the noise of the airflow? What do you guys think? Please tell me something to ease my mind.

8' is going to be noisy mate! 735cfm is alot of air ! buy a speed controller imo, turn it down, also buy insulated ducting and try to get the out take end as far outside as you can to reduce to vortex noise.

You're the 2nd person to tell me that...thats what I'm gonna do

i dunno i have a 6 inch inline and several other fans and i have no problems

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Its not the pile...

...its pilin' it high

I followed Hedge's advice and got the speed controller, now the system will only be as loud as I want it to be, Thanx again Hedge

Sounds control, odor control, vibration control, power control, heat control all that stuff is very important.

Sound - Gotta know how to build the system for sound control.

Odor control - Charcoal filters will do the job. Charcoal filters are used in the military to block a chemical attack.

Vibration control - Again, have to know how to build the system to control this.

Power & heat control - HPS lamps and LED lighting is the optimal type to use. I would stay away from LED lighting because tons of people are losing money. Very few led lights actually work.

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Don't worry, the white noise out there will cancel out your air flow sound.

I'm still living at home so i have no chance of hiding a growroom but theres a few plants at the side of the house. (my father smokes anyway so if he finds them he wont get mad, its my mother kicking me out im worried about).

One think i must ask is wouldnt people notice you carrying all this grow equipment into your new apartment? surely someone would see something when your moving in. Oh well.

replace chains with rope or strong string + anywhere metal is touching cover with duct tape n if u wanna go all out put housing insulation around the big fan boxes to reduce noise even more!!! or just throw a few bed sheets, the puffy ones over the grow box it reduce sound even more!!! worked a treat for me n costs nothing just time

Wow.. great thread...
Have just spent a good half hour soaking it all in..

Loving the box on the first page, however as mentioned earlier.. covering the inside of the box.. I'd use 1" flat sponge..
Hanging the box with rubber bands etc would be the best regarding vibration

I think the egg shell wall covering imo would reduce reflection of the light back on to the plants, however i recon if you put some in each corner then that might help a bit as well...
You got to remember though, where is the sound actually coming from i.e fan and ballast.

Digital / Electronic ballasts are much quieter than the magnetic ones that most growers seam to have..
hay also have many benifits like.. less heat, cheaper to run, more lumens per watt and of course almost silent.
The Lumatek in paticular would be the best on the market.


Also, I think someone was talking about noise from their inlet... why not try making a few inlets.. then air wont have to "woosh" so much through the 1 inlet..

I have to read up about varible fans speeds as I think some fans are not sutible for this due to the ball bearings inside..

Like i say.. good thread...