Stack Gas Dryer - Coin-OperatedSpeed Queen's stack dryer offers the same great fetarues as the single load dryer. Two commercial dryers in the space of one, both operating independently, including independent controls for optimum usage. Speed Queen's stack dryer combines heavy duty construction with reliable operation proven to stand the test of time. They're designed with less moving parts for one reason: so you'll face fewer maintenance problems and less wear and tear down the