The filter in that picture is up side down.

Doors are easy you build a 2x4 frame around the outside of the door. You then use like 1/2" door stop to frame in the door and place the foam tape on the doorstop. If you make the door flush with the outside frame you don't need to install doorknobs. A twist lock or pantry lock will be tight and work fine.
Zandor Reviewed by Zandor on . My Setup..stuck I started out with this great vision... then I smoked. :eek: My setup is three sections at: 3x3x9 the walls are 7 layers thick.. 1.) White paint on the inside (additive: Heatshield R-20) 2.) Particle board 3.) Heatshield III 4'x250' *roll* (used for its heating/cooling properties; not for reflectiveness) 4.) Insulation 5.) Heatshield III Rating: 5