Just what I was looking for. The unit works great and is indeed very quiet. I like the easy to read color ring that lets me know at a glance what the current air quality is in the room. Cleaning the pre-filter is extremely easy and overall the unit seems to function great in the default automatic mode. A great investment for your health, especially with wildfire smoke being a concern these days.
I just bought my second 45i in addition to the 75i and 45i air purifiers I bought earlier this year. There was one room in my home that could receive help from an air purifier after wildfires in my state caused moderate to unhealthy air in my area. On the auto setting, the 45is automatically adjust purifying power to handle the changes in the air quality. If you want to use a 45i in the bedroom, the lights on the purifier does turn off. It is recommended the pre-filters are cleaned every month. However, cleaning more often may be needed if experiencing wildfire smoke. Very happy with the quality of the unit, how easy it sets up and use. Indoor allergies and sleep have improved.
I have 2 dogs and 1 cat - all shed! I should have gotten this sooner. The auto function is truly the best, my air is finally that crisp quality I've been searching for.
Along with seasonal allergies one of our neighbors smokes quite a bit and the smoke would travel over and make me cough quite a bit. I could tell an immediate difference running this filter. This removed much if not all of the smoke from the neighbor as well as made the air feel better inside.