Boot dryer - xc or downhill skiing - hiking - etc

Step 3 The box

Here are the required pieces of wood. Bottom panel is not shown but is the same size as the top piece. The long sides have a groove: this is to allow thin pieces of masonite to slide in and out to open/close vent holes as required. The width of the shorter sides matches that groove. The hole drilled in one of the longer sides is for the fan air intake.

Since my dryer was for xc-ski boots, holes only had to 5 inches from each others, center-to-center. Downhill or Snowboard boots are bigger, so for those you will have to make that measurement a bit bigger.