The Whirlpool Whispure AP51030S air purifier is an updated version of the Whispure 450 model. The 450 was a solid performer, so as testing began we wondered how the Whispure 510 would stack up. It turns out the 510 is a nearly identical version of the 450, with one important improvement: The 510 is considerably larger. Why is this important? The larger the air purifier, the greater the area it can purify. Plus, more powerful models typically offer better results.

The slim-line Whispure weighs just 25 pounds. It uses a true HEPA filter to trap dust, dander and pollen as air passes through the unit. In front of the HEPA filter, a carbon filter traps odors and large particles. Both filters are surrounded by a grill designed to keep the largest particles from entering the air purifier. This grill also extends the life of the interior filters. We especially like the Whirlpool's control panel and control options. The integrated panel features electronic controls and a child lockout to prevent unwanted changes. We also were able to program our preferences, which is a nice feature.

Unlike most models, which offer two speeds, the Whispure has four fan speeds. This is important to note because the higher the speed, the noisier the unit. For example, you can run the Whispure on high only during times when you're not in the room or when pet dander is an issue. The slower fan speeds are still effective, but aren't as noisy, allowing us to easily carry on a quiet conversation near the air purifier.

The Whirlpool Whispure AP51030S is a powerful and effective air purifier. It has more speeds than most models, yet performs quietly most of the time. Its attractive slim design in a white-on-white style doesn't take up much room. Best yet, it is priced far less than other models we've tested that don't work quite as well. This puts the Whirlpool Whispure at the top of our list.


Pros: Four speeds, quiet operation, carbon and true HEPA filter
Cons: Doesn't have casters

Warranty
1 year