So I’m selling this purifier because I’ll be moving and won’t need it! It’s an amazing machine, I only used it for about a month, has a brand new HEPA filter in it. If you have any questions, let me know!! Here are some details (from the website): Captures up to 99.97% of microscopic allergens, 0.3 microns and larger, from the air that passes through the filter. SurroundSeal Technology helps minimize air leaks and ensures that the air passes through the filter. Intelli-Check electronic filter indicator reminds you when to clean the HEPA filter and when to change the pre-filter. Three Speeds. Includes long lasting HEPA Filter (24000) that can be cleaned. Replacement filter model 24000 or 3 HRF-F1 filters can be used to replace the original filter. Includes 1 Carbon Pre-filter. The Pre-Filter A (model HRF-AP1) needs to be replaced every 3 months. A filter light reminds you when to change the filters and they are easy to replace - no tools required. (Currently retails for $199)