Shark NeverChange HP152 vs PuroAir 240

The PuroAir 240 is a slightly better small-room air purifier than the Shark NeverChange HP152. The Shark has a slightly higher clean air delivery rate at its highest fan speed and will be quicker to clear the air in a comparably sized space, though only by a little. The Shark's Neverchange filter system is a bit of a misnomer, since you do have to replace the primary filter every five or so years, but that still results in lower ownership costs than the PuroAir, which uses much shorter-lived filters. However, the PuroAir runs quieter, and while neither unit comes with a remote control or Wi-Fi connectivity, the PuroAir at least has an automatic power adjustment feature, allowing for set-it-and-forget operation.