Pig-Pen
Member
Here's one for the Micro's. 
This is based on an Atrium Grate from the hardware store, outdoor plumbing. They come in a range of sizes, 3", 4", 6", etc. The one pictured is 3". This is perfect for veg or dryer boxes, or PC-sized bloom boxes. For larger and/or stinkier applications you can easily "T"-together 2 or more using fittings from the HDWR store.
Takes only a few minutes and no real tools.
What you need:
- Atrium Grate
- single legging, the cheap ones that come in the "eggs" are perfect.
- zip tie, or two
- a few ounces (for the 3") activated carbon.
Total cost, ~ $10 (using a 3", they get more expensive as they get bigger.)
- scissors, fingernail clippers, snips or whatever to trim the zip-ties.
- a length of Duct or Foil (I prefer Foil tape) to mount it.
It's self explanatory but I'll walk you through it anyhow.
Arrange your things out in front of you, such as this....
Now stick the Grate down into the stocking, (or pull the stocking over the grate
) as such....
Apply zip-ties just under the flange
Trim.
Pull the stocking back over the grate (or pull the grate out of the stocking..).... be careful not to snag and start a run on the edges of the zip-ties you just trimmed. You may want to put a piece of tape over it/them. Or just be careful.
Pour some carbon in, work it around and even it out. Add more as needed and keep working until you have a good, even 1/2" or so layer. Tie the stocking off and trim.
I should add that before you tie it off, you need to pull the stocking as tight as you can get it. This tension will allow it to keep it's shape for the most part, otherwise it will just sag downward. This is also why you need to use zip-ties or a hose clamp; if you use rubber bands or anything flexible it will come right off when you are giving it the "final tensioning".
You can use larger zip ties, obviously, so you only have to use one. Or you could even use metal hose claps or electrical tape or twine, so long as it doesn't slip over the flange.
From the inside....
Tape it up and yer done!
This is based on an Atrium Grate from the hardware store, outdoor plumbing. They come in a range of sizes, 3", 4", 6", etc. The one pictured is 3". This is perfect for veg or dryer boxes, or PC-sized bloom boxes. For larger and/or stinkier applications you can easily "T"-together 2 or more using fittings from the HDWR store.
Takes only a few minutes and no real tools.
What you need:
- Atrium Grate
- single legging, the cheap ones that come in the "eggs" are perfect.
- zip tie, or two
- a few ounces (for the 3") activated carbon.
Total cost, ~ $10
(using a 3", they get more expensive as they get bigger.)- scissors, fingernail clippers, snips or whatever to trim the zip-ties.
- a length of Duct or Foil (I prefer Foil tape) to mount it.
It's self explanatory but I'll walk you through it anyhow.
Arrange your things out in front of you, such as this....
Now stick the Grate down into the stocking, (or pull the stocking over the grate
) as such.... 
Apply zip-ties just under the flange
Trim.
Pull the stocking back over the grate (or pull the grate out of the stocking..).... be careful not to snag and start a run on the edges of the zip-ties you just trimmed. You may want to put a piece of tape over it/them. Or just be careful.
Pour some carbon in, work it around and even it out. Add more as needed and keep working until you have a good, even 1/2" or so layer. Tie the stocking off and trim.
I should add that before you tie it off, you need to pull the stocking as tight as you can get it. This tension will allow it to keep it's shape for the most part, otherwise it will just sag downward. This is also why you need to use zip-ties or a hose clamp; if you use rubber bands or anything flexible it will come right off when you are giving it the "final tensioning".
You can use larger zip ties, obviously, so you only have to use one. Or you could even use metal hose claps or electrical tape or twine, so long as it doesn't slip over the flange.
From the inside....
Tape it up and yer done!
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if it works well and doesnt resrict airflow too much than I very well might implement this design on my next PC case growbox build! So thanks much for sharing this design with us, it seems even easier than Suga Bear's design and looks like it would be just as effective. 
