Get the best large-room humidifier with the Stadler Form Oskar Big. It boasts a powerful output and V4 filter technology to keep your air clean and balanced. This 6-liter tank is perfect for big spaces, plus it has adjustable levels, memo reminders, and night mode functions. Stadler Form Oskar Big evaporative humidifier effectively humidifies areas up to 1100 square feet. Authorized Stadler Form dealer.