Review on RENPHO Air Purifier for Home Bedroom Allergies and Pet Hair, H13 True HEPA Filter, Removes 99.97% Odors Smoke Mold Pollen Dust, 3-Stage Filtration System, No Ozone (2-Pack, Black) by Tami Boudreau

Air purifiers are basically just a fan that blows air through a filter. That's it. If you remove the filter you can see the dimensions of its internal components which reflect this - there is a transformer, a squirrel cage fan and cables to connect the control box and controls. There's not much to screw up here, and Renpho has done well. There are four level modes: High, Medium, Low and "Night" mode. The device is loud on the high level, but quiet enough that I could use it on the last level during a video call. More advanced air purifiers include a particle sensor that turns the device on and off based on the current air quality. This block doesn't have one, but blocks that do have it cost twice or more than this one. Pros: - This is a traditional air filter, it works. I don't have a particle sensor to test efficiency, but Renpho is a fairly well-known brand and I'm not expecting any gimmicks here. It uses a squirrel cage fan instead of the axial flow fan found in most "tower" cleaners. , which generally means better noise levels, power consumption, and airflow. - Modern design, fairly compact form factor - Well packaged and presented. - Reasonable filter price. The filters also have a larger surface area than other small "tower" cleaners, meaning they're likely to last longer. Cons: - Filter change indicator is useful. However, it appears to be based on runtime rather than degraded airflow. Forest fires happen in PNW in summer, but the rest of the time we have excellent air quality; A metric that assumes a permanent loss of efficiency over time doesn't apply to me. - More than "tower" cleaners, but the result is better efficiency and noise levels due to a different fan design, as mentioned. - Not exactly a con, but I'd like a simple "schedule" so I can set it to medium for the night in my office and stay low during the day.