The name isn’t sexy. Its appearance is plain. But the Whirlpool AP51030K air purifier performs its job in a way that will definitely get you excited about breathing clean air again. The AP51030K won’t make you fall in love at first sight. But what it lacks in looks it makes up for in functionality. Within its rated size it clears a lot of air well and does so quietly. The controls are easy to operate and the cost of operation is modest.