Instruction: Answer the given question using the supporting document.

Input:
Question: Does this have the Permanent air filter? One reviewer mentioned having to replace the 3 stack of hepa filterv in addition to the carbon pre-filter.
Document: In addition, the box containing the air purifier I received listed the model number as 50250-S in very small font on the bottom right hand corner.Prior to purchasing I also researched customer reviews on the Amazon website.I found a reviewer comment (from 2008) stating that they had contacted Kaz (a Honeywell affiliate or surrogate) to resolve the issue of two different models, one with a permanent filter and the other needing replacement.
I had spent three days researching different air purifier's, before settling on this one. For those of you reading reviews before you make a purchase decision, it is a consumer reports top-rated product. It has a CADR of 250/450. It has two filters, a carbon pre-filter,which needs to be replaced every three months, and a HEPA filter, which needs to be replaced every 1-3 years.
The Honeywell 50250-s is one of the top rated consumer air cleaners available. I have owned it's predecessor for 20 years and have only been happy. It truly cleans the air as specified. The workmanship is very solid and my previous unit still runs as it did when new. I needed a new one in order to move the old unit to another part of the house. The hepa filter lasts much longer than 3-5 years as long as you keep the pre-filter clean and vacuumed.
My old HEPA got full of pesticide when I bombed the house for fleas, and unfortunately continued to return pesticide to the air for over a month until I finally figured out what the source of my contact dermatitis was. So I just wanted to replace the HEPA and the carbon pre-filter. Since I didn't seem to be able to do this safely, I decided to spend a lot more money to get a whole new air cleaner, which of course I expected to have a Honeywell filter in it. Not.
Overall a great air filter. It's kind of a pain to constantly replace the carbon pre-filter but it does a great job to reduce odors so it's worth it. A great value for anyone who has allergies or asthma.P.S. yes it's pretty loud but there's no way around it. The filter needs to move air through the filter at a certain speed to effectively filter the air. For the size of room this filter covers it has to move a fairly large volume of air.
Sweet product! !Simple design that works as good as the Austin Air HealthMate but at half the price.The only difference is that you have to vacuum the both the carbon/HEPA filter couple of times a year and maybe even replace the HEPA filter once every 3-4 years as compared to the Healthmate which just needs a filter change every 5 years.
The answer is quite simple - To remove dirt / dust from the air, you must cause the air to MOVE, and be collected by a HEPA filter. Moving air causes noise - the more air movement, the more noise.ON high speed, this unit is loud, and extremely effective. The permanent (semi-permanent, about 3 year) Hepa filter also avoids the significant costs of other HEPA brands. Other technologies involve flooding the air with ions or ozone (Yuck!)
was a bit bigger than what we expected so we had a bit of a shock when it was first unboxed - my honeywell 17000 looks puny next to it...note that you have to fit on the carbon pre-filter yourself onto the hepa filter drum - this gets a bit messy i.e.
So, it has a permanent HEPA filter. It also has a carbon-based "pre-filter" that wraps around the HEPA filter -- the carbon filter must be replaced, probably yearly.
Yeah sure,  Hepa filter microns microbes blah blah,  but it's the *carbon* filter (aka the Honeywell 38002 Enviracare Universal Replacement Pre-Filter) that keeps the house from smelling like a Bullitt County bingo hall. Change the carbon filter every month  or so  and you can lie to your children about having given up the Pall Malls. I bought the Honeywell 17000 first; it uses the same pre-filter, it's quieter and it probably helps a little.
Answer: This model does not have a permanent filter.  It has a long life HEPA filter which should be replaced in 3-5 years.  It also has a carbon pre-filter that they recommend you replace every 3 months.  The Honeywell 50150-N is the model that has a permanent filter.  Although, I just found the following note on iallergy.com at this website: http://www.iallergy.com/product_info.php?products_id=143Note: The 50250-S product is identical to the recently discontinued 50250-N which advertised a permanent HEPA filter. The only thing that has changed with the 50250-S is the product packaging. While both the air purifier and included filters inside have not changed, the packaging now advertises the true HEPA filter as long life as opposed to permanent. Again, only the advertisement has changed, the product remains the same.