As do I.
So getting back on track here, what are you thinking for enclosing your electronics now?
I typed up a reply to this like 4 times right after it was asked and when I was almost done each time the reply screen would randomly refresh and lose my reply, then I just gave up.
I have a full sheet of 3/4 MDF that I'll use for the build and use calking to seal up the inside seams to prevent air leaks. I'll probably just build a basic 'box' with the intake fan on the bottom behind an air filter to push air up from the bottom and another filter on top to prevent dust from coming in from the top to allow the heat to escape as easily as possible without building up.
The shelves will likely have 1/4 in holes drilled/routed into them to allow air to pass up and through them to prevent heat buildup. Still not sure about the front lid, not sure how I'll secure it to be air tight while still being able to use the receiver remote, I might see if I have an IR receiver wire laying around and I might use that instead of having to jack with Plexiglass (which is a horrible looking dust magnet).
Some of my top items to consider/worry about
1. Making sure the box has enough room to allow for proper airflow
2. Finding a filter that will both filter out the particles I want and still allow for proper air flow
3. Making sure the fan I'm going to use will push/pull enough air through the enclosure.
The biggest unknown as of yet is what type of PC I'll be using.
1. The Raspberry Pi 2/3 are the one I'm hoping to be able to use, it lacks power but its a super small form factor, low power consumption make is a perfect shop PC. But Linux has no SketchUp viewer and the few that I've seen for Wine require too much power and the Pi can't run it, I even tried the SketchUp Cloud based browser viewer, no luck there either. I am running some tests with VNC viewer/server to my primary PC in the house, looks like it works but since its technically a remote desktop the mouse/keyboard commands might not work very well to use in SketchUp, but testing is in progress now.
2. I have enough spare parts to build a low to moderate PC. But building a box to house a mid-tower box is more material and effort than I am willing to do, and I think my current fan would not be enough to counteract the fans inside the PC case and might mess up my airflow. And in the end it still might not be power enough to use SketchUp, or might run it barely and be a hassle.
3. 4 Year old Gaming Laptop - This would have plenty of power to run any programs I would need in the shop but its a power hog, battery is dead (but can still use it plugged in), and it gets far hotter than the other two combined which again has be question my concept in terms of being able to remove enough heat to keep things from getting too hot.
So as you can see those choices could have a big impact on the build itself, once I decide on this then I'll get in SketchUp and start mocking up some ideas.
I do pretty much what woodenthings suggests. I have 3 small two stage air filters. I use a 2hp HF dust collector with a seperator/Wynn filter and a shop vac to collect dust/chips at each tool.
Never had heat or dust related problem with:
24 port switch
4TB NAS drive
2 backup power supplies
Various battery chargers
Gas water heater
High Effeciency furnace
As some have said, you can not eliminate all the dust in your shop or your house for that matter atleast not as a practical matter.
You could build a positive pressure cabinet using a hepa filtered blower. You have to ask yourself, is it worth the cost for something that may not happen. Maybe more importantly, would it be worth the inconvenience of working out of a cabinet.
Do you have all those items in your shop space? I would definitely be concerned for the Water Heater and Furnace as they have open flames and could push contaminants into your ducting or other areas of your house. When I invest in my table saw I will then invest in the 2HP HF DC and upgrade it with a separator and Wynn or similar filter, which I'm sure will reduce the overall dust in the shop, but MDF, sanding, etc all cause the fine dust that likes to float around get get into lungs that is my biggest concern for myself and my electronics.
I also stated several times that I fully understand and have zero expectation of being able to filter out all dust, but I think getting 95% or more of the remaining airborne dust filtered prior to hitting my electronics is a pretty realistic goal, which should easily still be less dust than it would see in a standard home theater/living room setup.