This is certainly the largest air purifier I've ever seen/owned. I have the Shark HP202 purifier for my downstairs and this one is an extra few inches taller than that one! However, this is an absolutely amazing product. The purification is second to none and within an hour had our upstairs smelling like a "new house" smell. So amazing how quickly it works and detects air impurities. The fan/heater is a great addition too along with the oscillation feature. I live in the southern US so I will probably main use the fan function. 5/5...you won't be disappointed.