Most common allergens like pollen, mould spores, pet dander and dust mite faeces range from about 100 microns down to around 0.3 microns. A good quality air washer is capable of removing up to 99% of fine dust particles and symptom-triggering allergens. Air washer manufacturers indicate the recommended room size for their devices.
For abedroom or baby room, you may want to use a quieter air washer that comes with "night" mode. Air washers with "night" mode run quietly in the background allowing you to enjoy clean and moisturised air while you sleep.
Below is the selection of suitable air washers tailored to meet your needs and sorted by price in ascending order.