I'll try to me a little more in depth info on how I made my spray booth. I got a plastic storage box at Walmart. They have an aisle with 50 different sizes. I got one about 14 inches wide by 24 inches long. It is about 16 inches tall. It has a snap on lid. Anything close to this size is fine. I went back to the housewares dept, not towels, but bath organizers and stuff like that, it is in the back of the store by the paint dept. I found a 3 spd fan there for $11. It is in a square plastic frame, it is white plastic.
I next placed to the fan against the back, one of the 12 inch wide sides. I set it toward the bottom of that panel. I traced appx the diameter of the fan on the back of the box. This is not critical. I got out a pair of curved tin snips and cut out the area where the fan would blow out. The edges of the fan cage are all plastic and there is nothing inside that is critical except where the control switch is.
I also cut out the panel at the other end to allow access to the painting area.
I held the fan inside the box and with my cordless drill, I ran some self tapping screws thru the box and into the corners of the fan fan cage. They don't need to be in an exact area, only thru the box and into the fan edge. In the lower corner where the fan switch is you either need to be careful you don't run a screw into the switch or wire or just don't put a screw in that corner. At this point you have your box with the fan installed so it will blow out the back. You also want to run the plug out the rear opening.
All of this is not critical. If the fan can even blow at 30-50% capacity out the back it will easily pull all the overspray out. The fan can just set in the box in front of the rear opening and not even be fastened down. You can use a glue gun to do all of this just as easy.
Next up you want to cut the top of the box in appx half or at least to cover the fan space and a few extra inches for filter. Use a 12 inch or 14 inch wide furnace filter to fit in front of the fan and to catch the exhaust. You can hot glue or screw a piece of wood on the box sides to line up with the half top you have. This wood can be screwed or hot glued to the box sides. Your filter will lay against this wood. Size the wood to be sure it lays against the side and also lays behind the filter. It doesn't have to be wood, it can be a piece of cardboard bent at 90 degrees and taped to the box and to the filter. anything that works. I duct taped all seams of the wood and the filter to the box to make it draw thru the filter 100%.
All that is left is to place a disposable filter in front of the permanent filter. You now have 2 filters and the first stage filter can just lay in place and be replaced or inverted ( I get a 24 inch long filter) to get fresh filter face. You now have a booth.
I will try to draw up an illustration that is clear and post it next. Bear in mind there are many ways to do this and a simple cardboard box and any kind of small fan will work. Even just a small fan behind your work area with a fan in front of it. A fan like this will pull all the overspray you create if it is anywhere near your paint area.