ST-X2000 is a scent aroma machine for large area of 3000-5000m3. The capacity is 1L which can eliminate your worry to refill fragrance oil frequently. There is a super powerful pump and fan inside the machine so that it can spared the scent to space quickly and evenly. This model can stand alone, hooked on the wall, or connect with the HVAC system. If you are choosing scent diffuser for large commercial area, you may consider it.