Honeywell True HEPA Air Purifier Plus Series for Extra Large Rooms (model HPA300). Although the model has been discontinued, the filters for them are still being produced and are easy to obtain.
It's in great working condition and comes from a non-smoking household with a cat. I simply don't have enough space in my new, smaller unit. (I'm still using the smaller one.)
HEPA air purifier for large rooms (East Watertown)
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