I saw the mesh version you are planning but I don't have as much vertical space as you do, I only have 32" for everything, so I had to improvise. If you pack the carbon in tight and only grow 1 plant in there I don't see why the mesh filter shouldn't work. I posted this last november when I asked when to flip, which explains what I did for my filter..
"If anyone is interested, I have an external 5" pc server fan on top of the cabinet that is rated at 150 cfm, this is sat over a jigsawed out hole. Internally I got a 2" deep A4'ish sized box and cut a large rectangle out of the front and back, put wire mesh over the holes and then 2 layers of oven hood charcoal filter top and bottom. The remaining space was then filled with a mix of activated carbon pellets I got from my local hydro shop ( 1kilo for £3.70 - bargain!!) and some smaller pellets I took out of some respirator mask cartridges we had at work for some reason. Stuck this to the top of the cab underneath the fan hole with double sided tape, and taped all the joints of the box and where it joined the roof with shitloads of tape so there was no chance of air bypassing the filter. I love duct and parcel tape!! This means the fan is pulling air through quite a large surface area that is also about 1.5" deep with carbon, so hopefully it should keep the smell to a minimum. The pc fan has lost a lot of cfm with the filter in place, but it still comes out with a force you can feel with your hand, but as my cab is only small there is still enough of an air change to keep temps down and replace the air regularly."
The 1st pic shows the filter during my first ever grow, when I used cfl's. The second pic shows how little room I have when I cram 2 plants in there with store bought led bulbs. I cut those down last sunday and had just over 500g wet, so hoping for 3.5 - 4 oz dry. I had to put the globes back on some bulbs as they were bleaching the leaves. I think I may have to go cob in the future to save me a few inches. Last pic shows stealth cabinet in situ...nothing to see here *edit the cabinet is an old set of drawers in my garage, which is why it looks so battered and filthy. I am not a scruffy bastard who lives like that!
