The first brand that comes to mind when talking about air purifiers is the Honeywell line of air purifiers. They have new units coming out all the time. The most popular units appear on Amazon’s top air purifiers list. The most popular of those are the HPA300 - HPA100 series which are value brand, simple purifiers with a normal thick tower design. They include all of the necessary features you'd want in an air purifier such as variable fans speeds, sleep modes, auto shutdown timers and filter change indicator lights. The newer models such as the HPA5300b and HPA8350b are elegant designs that take the same filters and have a few more features and an updated design, but stick to the normal honeywell look. These new models often come with the ability to connect to the internet in your home and on your phone so you can control them from anywhere. Some of the newest models also test the air in your home periodically so they can adjust to your needs without you having to lift a finger. Like most OEM brands, the replacement filters leave more to be desired because of their higher prices. These higher prices stem from all of the overhead that Honeywell needs to account for. Breathe Naturally is able to offer the same quality and sometimes even better quality for a substantially lower price because of that very reason. Breathe Naturally MERV 17 HEPA filters stop harmful airborne particles down to 0.03 microns small at a 99.97% efficiency level. Capture mold spores, dust, dander, pollen, bacteria, virus carriers and tons more airborne particles, leaving the air you breathe clean and healthy. Our filters are perfect for those with seasonal allergies, sensitive respiratory systems and people who just want to Breathe Naturally. Breathe Naturally carbon filters are made from Bamboo carbon and are proudly made here in the USA, supporting American companies and jobs. We take pride in our specially designed carbon filters that are made to be thicker, last longer and capture more odors and particles that ultimately leads to a longer lifespan on your HEPA filters saving you money and leading to less waste. We recommend changing HEPA filters based on use, usually every 4-6 months for normal use, and every 1-2 months per carbon filter, again with normal use. Those who put extra strain on the air in their homes, such as larger families, people with pets and people who live in larger cities may want to change their filters more often. Most modern air purifiers come with a filter change indicator light that will let you know pretty accurately when you're due for a change. When changing your filters, dispose of dirty filters in the garbage. Reset filter indicator lights, and enable child lock if needed and available. Breathe Naturally firmly stands behind their filters and trusts them in their homes and the homes of their loved ones. We offer a 30-day money-back guarantee on all purchases. Satisfaction guaranteed or your money back. Our carbon filters are proudly made in the USA. All filters ship from Minnesota, a family owned and operated company. Do not place the air purifier too close to your head, and refrain from having the air blow directly towards you. If you have any questions about Honeywell air purifiers and replacement filters or any other questions please don't hesitate to drop us an email or give us a call. All of our contact information can be found in the About Us/Contact us section of the website.