The desktop germ guardian is fairly compact, sleek and easy to move room to room if needed. On high setting (#3) you definitely know it’s there but it does move a good amount of air, Settings two and one are pretty quiet I think and you can still feel the airflow. At first use with the UV light on you’ll smell a slight ozone smell but goes away after a few hours. I originally bought the germ guardian tower air purifier with UV light and was incredibly happy with it I’ve since bought this desktop air purifier and also a plug in automatic UV odor eliminator from germ guardian and am very happy with all products! We have forced air heating in our home and live where it’s winter near 6 months of the year and even tho I keep up on quality air filters for our forced air unit it’s simply just not enough with a family of 4 with 1 cat. I run this desktop air purifier throughout the day periodically with the UV light on then at night time in my child’s room on low setting with the UV light off and in the morning the air in there room smells and feels clean and fresh, we also use it in our teenagers room who has a gaming pc he’s on for hours at a time, with how teenage boys rooms smell this little desktop air purifier takes care of all the boy odor and has cut down on dust dramatically. Every unit I’ve purchased from germ guardian has been phenomenal so far, ready to use out of the box just follow instructions provided, make sure filter is installed correctly, plug into wall and you’re good to go! 11/10 recommend!