ST-MAX is a split type aroma scent machine with glass touch panel, steel casing and aluminum bottle. This model is specially designed for HVAC and there are two choices of bottles: 1L and 5L, you can choose suitable capacity according to your actual demand. Built-in long life-span air pump which can operate up to 8000 hours continuously , powerful enough to cover 8,000 - 10,000 cubic meters. Intelligent LCD display can set working periods and scent intensity freely. It is suitable for large hotel, shopping mall, office buildings etc.