Instruction: Given a question and the related document, and generate the answer to the question based on the information provided in the document.

Input:
Question: I have 2 cats and unfortunately developed allergies to their dander will just one work for a great room ?
Document: I have 2 litter boxes for my cats. Before buying this product, I would use odor neutralizing sprays near the area to cover up the odor between cleanings, but this would not always work. After buying this product, and placing it near the litter boxes, I have no longer noticed odors between cleanings.
We bought this for a stuffy stinky bedroom with bad circulation. The room always smells nasty and stale in the morning and never smells or feels fresh. We put this in the room, clipped a little fabreeze car vent air freshener to the air output and holy fabulous! The room is fresh and smells great all day every day. It even feels cooler. No more breathing problems in the 144 square foot bedroom from pet dander or stale air. I'm buying another one!
My daughers boyfriend is alergic to cats. This Purifier keeps him from having to use his inhaler at my house.Quite and work great.
For pet owners, this item is a must buy item that works to reduce pet dander in the air. Prior to getting my puppy, I never had used an air purifier as I had never really felt a need for one. With each passing week with my new puppy, my allergies were getting worse and worse to the point where I was constantly sneezing heavily and feeling congested around her and waking up each morning severely congested and sneezing.
Bought two of them, one for each of my boys rooms and they definitely improved the air quality. We have 2 large dogs and it was causing my boys issues breathing due to dander. It is not as large of an issue as it was before the air purifiers.
Seems to be doing the job! Definitely keeps the dust from the clay litter of 2 large cat boxes (for 2 large Ragdolls) down. I had another filter previously that cost me a lot more but did not work as well as this one. It is also very, very quiet on the low setting.I have had it approximately 5 weeks and the filter indicator shows it is a little bit more than half used. I am hoping that is only because of the initial use.
After 3 months, I can confidently say they do help with the smell.For those combatting dog stink:1. We use one in the bedroom of moderate square footage and a 2nd one where the dogs hang out while we are at work, also of moderate (maybe 200sq ft) square footage.2. For continuous cleaning (especially at bedtime overnight) the WhisperClean setting is almost imperceptibly quiet and keeps the stink to a minimum.3.
Wow! I received this yesterday, installed the carbon filters (2 are included - these filters aren't required for the air filter to work, but my understanding is that they are necessary for odor reduction), it was all very simple. Put it in the room with my litter boxes on the "medium" setting and within hours there was a noticeable reduction in the smell.
I purchase this because of my 2 cats and 1 dog. This thing save my nose! Every time one of the cats used the litter box our small house smell really bad until I had to clean the litter box ASAP. Now they use the litter box and no smell. Amazing! I just wish I brought this purifier years ago. Easy to assemble and plug in to start working. I use the whisper setting and when I clean the litter box I use the medium setting.
I bought these for around our home as I get seasonal allergies and we have 3 cats. Figured like a win-win. So far it has been doing very well as I've noticed significantly less allergies, but not much impact on the smell even with regular replacement of the carbon pads. Still pretty happy with it and it is very quiet. We keep them on the medium setting most of the time and switch them to whisper mode if we are in the same room with them.
Answer: It will cover a pretty good sized area, provided that you keep the filters clean.  I have mine in a room that is about 15' x 20', and it works great.