Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: Do you have to buy filters for this? and would this be good enough for a large living room?
Document: Given its small size, it is very good in removing odours within an hour. It is abit noisy at High mode but its still bearable. Recommended for those wanting to clear a room meant for study, sleeping or relaxation from bad odours and particles that may invisible to the naked eye. Not that powerful enough to clear a living room as it is not speced to do so. :)
It is quiet, keeps the dust down in the house and is attractive enough that it doesn't catch attention when one enters the room. Would definitely recommend this for anyone who has a dust problem - like living in the high desert.
As a suggestion, use a good vacuum with a hepa filter to clean it with or you will just be sending dust back into your room. The carbon filter pack that Amazon sells works well and each filter will actually give you two filters since you need to cut each one in half to fit this unit (there are perforations in the filter to allow you to do this easily).I am happy enough with this unit that I have just ordered another one to place in my home office.
But it's just about worth it because the filters do a good job of keeping the air clean. The one exception is the performance of the machine in the living room, hangout for the aforementioned perpetually-shedding dog.
I like the size and ease of moving it about. HOWEVER, the thing is very noisy, even on low speed. I see no way to lubricate the motor anyone could sleep with all the noise this machine makes. The expense of buying a large box and shipping it back is the only reason I kept the machine. I must say that it does seem to do a fairly good job in cleaning the air. My advice is if you don't want a real noise-maker don't buy this one! !
I've had this unit for a long time and was recently looking for replacement filters. Honeywell doesn't make them any more exactly like the large, one-piece filter that came with the unit. You have to buy two narrower ones. Others have complained that the two smaller ones don't fit like the one-piece filter did. I'm about to find out. Filter replacement for two smaller ones is around $50.
After owning this model for almost 3 years, I have tried to buy the replacement filter. The filter in the manual is described as a HRF-F1. This has changed on the honeywell website to a HRF-D1 and requires the purchase of two filters! Two HEPA filters and shipping costs 1/2 of the entire price of the unit!! The universal carbon pre-filter is already enough mess (the fibers drop everywhere) to cut to the correct size and wrap around the HEPA filter.
It does sound like a fan on High, but it is moving a large volume of air on this setting. Also it works great on High at masking other noises from the outside so it serves a dual purpose in that effect. Overall very satisfied with it. Great product. Should have done this sooner.Also I am getting a Honeywell 50250 for the living room. I expect it to perform just as well as this one did.
I have a fairly severe dust allergy, and as a result have a whole house air filter on my furnace as well as room air purifiers. This one is in the living room, which is too large for the size of the air purifier, but I prefer the combination of it's moderate size, modest noise level (it is fairly quiet, particularly on low), and filtering ability (it works pretty well in a space that should have a larger size) to some larger air purifiers.
Since I run it 24 by 7, I usually turn it on with lower setting which is quiet enough not to bother me. This unit is much lighter than the Hamilton Beach 04162 that I have. Especially with the handle at the top, it is just so easy to move around. In fact, I purchased a second one to place it at the living room, in addition to my finished basement.
Answer: It comes with a HEPA filter and a charcoal pre-filter.  I would suggest buying a pack of replacement charcoal pre-filters at the time of purchase because they get used up every three months or so.  I think that they reccommend it for use in rooms that are 168 square feet (12 by 14 feet).  I use it in a larger room, and I think that it does accomplish something (I see less floaties, smell less kitchen odors), but its not as effective as the unit I run in my bedroom, which is a smaller area.  If you have serious allergies and this is the solution I would buy a unit that is suggested to run in the size room that you have.  If you're a mild allergy sufferer, then it may do well enough for you in a larger room.