GermGuardian Germ Guardian FLT5000 True HEPA Genuine Air Purifier Replacement Filter C for AC5000E, AC5250PT, AC5300B, AC5350B, CDAP5500, and More

These do a great job at filtering out particles like pollen, dust, and make a huge difference in places that are dusty by nature (for example, next to a bus/train station). I tried the copycat replacements, but they either don't fit correctly, or have issues in manufacturing. One thing to notice is that the HEPA filters do last as advertised, but the charcoal filter needs to be replaced very frequently in order not to block the air flow in the filter. Germ Guardian could provide original replacements are a lower price point, as their competitors are basically using the same material and it's a straight cut (no assembly required). However, I am happy they include the charcoal filter with the replacement HEPA filter as I probably wouldn't have understood the benefits of the charcoal filter if they hadn't. Overall great product, just a little high on the price point but I do support the brand and their development of air filters so they get my money at least once a year, per each filter in each room.

After powering one in a room, it just semi-quietly hums as it filters. We normally do not run at max speed. There is an indicator to show a "full filter". Replacement is easy and fast. We vacuum a "full" filter and reuse it maybe once before it fills with enough fine, un-vacuumable material to reduce time between changing or cleaning too much. It is pretty amazing how much stuff it finds to filter from our "clean" air and house.Replacing or rotating to a new or cleaned filter takes well under a minute from start to finish. Owning two sets of filters for each device in your home makes changeouts very fast.

This is the only filter I've been able to find that fits our unit properly.

These were a good value for replacement filters. The convenience of quick Amazon delivery was also a huge bonus!

I've used these filters for a few years.