Can anyone answer this for me?

I didn't understand until I reread your post. Can't answer definitively, but I think you might run into issues trying to push air all the way through 10" of carbon. 90CFM doesn't seem like it would do it. Plus, it seems a bit inefficient, you would lose a lot of airflow if it does work. You need either something of smaller diameter to put inside (and a lot of drilled holes) to make something like the filter from this post, or two 4" diameter pieces of screen so that you can have something like || || . The air would go through the first screen of the can, through carbon, through one of the screens you make, through empty space, through the second screen you make, through carbon again, then the final screen. I hope that makes sense. You would have carbon on both ends with empty space in the middle and the air would filter twice.

Only way to know for sure though, is to try it your way first. Some fans have better resistance against back pressure than others.

love this DIY, built 2 of them and love them. I am using them on my vegging cabinet just to catch any stray smells. Only mod I did was to drill a whole through the end of both cans once it was assembled and but a bolt with a wing nut on it just to hold the two cans together.

But my wife is also confirmed in cup sizes,,,,, ba dump dump,,,,(rim shot) sorry,, just had to ring in,,, and now back to your regularly scheduled thread......

very nice, ive seen a few diy carbon filters but this one looks legit... great job

Well the walmart lady must have lied to me, or they just stopped stocking the big ones. I went there the other day and saw the small pencil cup so I picked it up, as it was better than the small one I got form Office Depot (doesnt have the lip around top).

Put it together, packed the carbon down in there and attached it to my exhaust fan. My fan prob exhausts about 10x less than it did, but that was expected. My plants arnt even out of vegging yet, they are just giving off the plant smell (pretty strongly too). That is why I hooked up the carbon filter. After about 3 days of being hooked up, Ive realized it doesnt work very well. I can still easily smell the plantish smell. Couldnt imagine how it would work with the plants flowering. Hopefully others have better results.

Attached Images

CarbonFilter.jpg (41.8 KB, 80 views)

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My first ever grow! Snow White feminized seeds!

nice diy how big of a exhaust fan you think will be appropriate

Well Ive got a 6in fan with 240cfm free air and it only exhausts about 1/4 as much as it use to.

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My first ever grow! Snow White feminized seeds!

just what i was looking for.. 3 questions

is it quiet?

what kind of fan are you using ?

if i used a pc fan that im using now will it work

Once attached it did dull the sound of my fan a SLIGHT bit, but only because it caused my fan tow ork harder, and spin slower.

Im using an Aero-Flo fan. Cheapish fan, but 240free air cfm isnt bad.

Dont think a PC fan would work all that great for it. Think it would depend on the cfm of the fan.

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My first ever grow! Snow White feminized seeds!