The TPP230M Air Purifier has a Permanent HEPA-type filter, meaning it is not manufactured to be replaced.
Instead, the air purifier has a "Clean Filter" indicator which illuminates when the filter needs to be cleaned.
Once the indicator lights up power off the device, remove the filter, then use a vacuum hose to remove debris from the filter.
Once you have cleaned the filter place it back into the machine, power on, and hold the "Time" and "On/Off" buttons simultaneously for 3 seconds to reset the "Clean Filter" indicator.
Thank you for your question about the Honeywell® True HEPA Air Purifier.
This air purifier has a 5 year warranty, though it can last beyond that with proper maintenance:
Hope this answers your question!