I definately needed a lumber rack in my new small shop so I got to looking around the internet at other peoples ideas and builds and most of them seemed pretty complicated or they protruded out from the wall to much for my small shop.
I came up with a simple but strong design that doesnt force you to sacrifice space nor does it take alot of tools, materials, or complicated jointery to build. In my small shop I am trying to put alot of things on wheels and this lumber rack is not built all the way to the floor so that I can roll tools underneathe it.
So take some time to watch this video and build yourself a great lumber rack.
I recently remodeled my basement and theres a lot of dust (including drywall dust and sawdust) and fumes from paint, cleaners and other building materials. Its an underground basement and mold has to always be a conern too. Because part of the space will be my home theater in the future I plan to get a more expensive air purifier thats smaller and quieter such as this Fellowes Quiet Air Purifier AP-300PH with True HEPA FilterI came up with a simple but strong design that doesnt force you to sacrifice space nor does it take alot of tools, materials, or complicated jointery to build. In my small shop I am trying to put alot of things on wheels and this lumber rack is not built all the way to the floor so that I can roll tools underneathe it.
So take some time to watch this video and build yourself a great lumber rack.
The box is sealed very well. Not only is it taped but the seams are also glued together. To get the filters out of the box I cut the top where its perforated with a utility knife as shown.
Be careful not to cut too deep and damage the filters. Keep the box someplace safe to the side while we continue. 
With the filters lined up, tape one of the short (20") edges of the filters to create a hinge between the two filters as shown.
I decided to go with white duck tape so it looks a little nicer but it makes it hard to see in the photos against the white cardboard filter frame.
Use a strip of duck tape to secure each side to the side of the fan.
Using a pencil, trace around the filters (while pressing down the cardboard so nothing moves) to mark where the cardboard needs to be cut.
Repeat the process for the bottom cardboard. The other large piece from the box is seamed but its taped and glued and very stiff so it shouldnt be an issue but you can run a strip of duck tape over the seem if it makes you feel better.
After taping up the sides of the bottom cover to the filters, I added an extra strip of duck tape all the way around where the filters/cardboard meets the fan for added support. The rounded corners of the fan means there might still be an air gap there so check them and add extra duck tape if necessary. On the bottom there are also some holes, duck tape over those as well. Finally, replace the feet.
