【4-in-1 Premium Air purifier】Upgraded home air purifier works better, the H13 HEPA works with an ultra-fine pre-filter, activated-carbon-filter, and Nano-Silver-coating-filter traps most pollutants like pet dander, and other large particles, reduce unwanted smells from pets, smoke, cooking fumes. Note: For the first time use, please open the bottom of the air purifier, take out the part, take out the plastic bag and then install. (The replacement parts Asin is: B08Z82W1B2.) 【Ozone Free】HEPA air purifiers for the home will not produce ozone, good for children and Asthma sufferers. Certification: CARB certification, EPA certification, ETL certification (Available for California). 【1,540 sq ft Maximum Coverage】Our large room air purifier can clean a room up to 1,540 sq ft in 1 hour, 770 sq ft in 30 minutes, 385 sq ft in 15 minutes. Perfect for living rooms, large rooms, bedrooms, offices, nurseries, dorms, and kitchens.