Need a paint booth that does not vent outdoors

I have an Artograph 1520 which has three filters. I bought everything I needed to exhaust to the window via a 4" hose, but after using the booth in the middle of Texas summer (when I really didn't want to open the window), I found that the booth filtered so that I didn't smell anything in the house from spraying. The only down side is that the filters make for a somewhat spongy platform for models. It isn't an issue except for heavy things on my Tamiya rotating pedestal.

The prefilter catches most of the paint so that it is sacrifical. They sell a roll of it, but I've still not quite used up my third "sheet" which came with the booth. I like it.

This seems interesting.  I am also looking to build a spray booth and I do nto have access to opening the doors or the windows unless I want nature to creep into my work area.

Don, I base my idea on a filter I once saw,,,,,,it had a mesh screen, with the charcoal in a layer, but, fluids could still pass through it,,,,,,,I figured a "large chunk" layer of charcoal, then a "large chunk" layer of rock , etc,,,,,,,if it will pass a machining fluid through at a relatively low psi, it should pass air,,,,,in fact, we used an air hose blowing through the boxes to clean them,,,,,,,we just unhooked the blue Fluid hose, squirted air through, caught the solids in a coffee filter looking strainer,,,,,,and hooked things back up

this thing caught paint, poisons, aluminum and gold flaking, and anodizing particles

it was efficient enough that once cleaned with the hose, it went back to duty, it should last a good long time with hobby paints,,,,,,,especially since we wouldn't care too much if we got paint flecks drying on the rocks

think of it as more of a "paint maze" rather than a bucket of sand,,,,,,,,the larger the "chunks" the better the air flows and the more places for the paint to "hit and fall out"

The problem I see with a charcoal filter is pressure drop. I would think you'd need a pretty good blower to get the stuff through a water-type charcoal filter. If you are just blowing over the top of a bed of charcoal it might be easier, but for the airflow of a typical spray booth I think you'd need a pretty good sized bed.

you might go to a PetSmart and take a look at the plastic fish tanks, and the associated charcoal items

I have long thought about building a charcoal fume system, by venting a spraybooth hose into the bottom of the endface of a fish tank full of charcoal and fish rock alternating layers, with a lid on top with a "mushroom vent",,,,,I am sure it would help with getting the solids out of the fumes from Acrylic spray booth exhaust,,,,,I don't know about Enamel based fumes, though

I imagine that it will be stupifyingly expensive but carbon filters in a system will absorb dangerous fumes.

Chris

I frequently do not vent my booth during the winter.  Depends a lot on the objective of your having a spray booth. Even without venting I find my booth, single stage fan and good filter, does reduce the smell considerably.  While the total vapors probably end up the same total amount as with no booth, I believe it does at least release them slower and hence may reduce peak concentration of dangerous vapors.