Welcome container fans and otherwise DIY-inclined readers, thanks for stopping in... I've been collecting suitable containers and bottles for the last week or so, while waiting for my fan to arrive. Now that it's here and I've sorted out the thermal control issue that I had (thanks to the help of GC), I'm ready to make a proper DIY carbon filter. I'm going to be using these containers, and maybe even a little hardware cloth from H.D., as well as caulk and aluminum tape for a nice seal and a little reflectivity. As you can see there is neither caulk nor mesh on the table. That's for tomorrow, you know, a nice little Saturday. I'm hoping to have this thing finished and installed by the end of the weekend. Here's what I've got to work with: ... If I can't accomplish this I'm an idiot! My main design points and goals for this project are as follows: 1) The filter must flow. Heat is an issue in small containers with even as little as 100W, and this filter will be doing all the exhausting. A/C on the intake is not happening, as this would more than double the electricity budget for this build, so I've got to make sure the cab can breathe. Since my fan is (I hope) powerful enough, I've got to design the filter well enough to address both issue 1 and 2. 2) It's got to pass the nose test. Since my Rubbermaid will be close-ish to my front door, I don't want anyone delivering food or passing by to be able to smell it. Chances are, if friends are over they'll be smoking as well, so it's not imperitive that this thing be 100%. 99 and change will do 3) That the filter is small enough to fit inside/above an otherwise space restricted 18 gallon Rubbermaid container. This also means, for me, that the filter must be self contained, with no ducting. Fan and filter as one. If possible, I'll design the unit so that the fan can be easily attached, with one of the lids I've got. 4) And finally, of least importance I guess; that the filter will act as a muffler for the 45db fan it will house. I'd really like to keep this unit quiet. The 80mm fan was great on the ears, but flows barely enough to keep the lit cab cool, un-filtered... I'd like to keep the noise level as close to that as possible with this new fan. I know the carbon will help with this, just not sure how much. So, that's the plan... now to get to getting! I've already got my eye on that pencil cup. I'll be sure to post up the final product(s), and installed. Thanks for checking out my thread, I hope this helps some other beginners on their way to making DIY filters.