20 years ago I made bows in a 5'X7' corner of the garage by the water heater, space was limited, I needed a drying box I could hang high on the wall and out of the way. I made a 12"X12" box with three light bulbs on a bar, vents at the top and bottom and a dimmer switch to control the temp. With the dimmer switch the light bulbs last forever. I can barely turn the lights on to a mild glow and get 100 degrees in the box, cranked up half way I get 120 degrees. I put a shelf in my box to sepperate the light bulbs from the drying wood.
I don't feel a fan is necessary because of the natural draft front the air heating in the box.
The first shot is one of the two top vents on my box, there is one large on in the center of the box on the bottom.
The box worked so well I took it to my new shop.
The third shot is my dimmer switch to control temperature.