I built a drying box for holsters and belts. The box is 2x3's framed and sheeted with OSB. Box is insulated with 3/4 inch foam board. Dimensions are 6 ft tall, 2ft x 2ft wide and deep. The heat source is a couple of heat lamp fixtures that I used for brooding chickens. I use 250 watt heat lamps most of the time. I can plug and unplug heat lamps to control temp. I have a remote temp gage that allows me to monitor the temp. I also sometimes use a single 100 watt bulb that keeps temp around 70 degrees in the box. For ventilation I used a 2 inch holesaw at the bottom of the box (heat lamp wires go through this) and 2 holes at the top. I stuff rags in the holes when I want to retain the heat without venting. I strung wires across the top to hang holsters and belts from. I made this so tall because of the belts. I also rigged a couple of brackets for installing a wire shelf when I need it. I have been getting ready for a gun show so I have been using the box a lot. I works very well. I transformed my garage into my leather shop so space is not a problem for me.