The list below will help you find the best box fan for your needs. In this article: Lasko Air Circulating 20-Inch Box ... The control panel has three different speed settings, making it adjustable ...

Here is a simple mod to allow the speed ... or variable resistor in the 12V wire to the fan. The rheostat should be rated at least 3 Watt, (for fans up to 10Watt), and have a resistance of 20 ...