The Alen BreatheSmart FLEX can be customized to meet the air purifying needs of any average-size room. The BreatheSmart FLEX features designer panels that come in a range of colors and textures. As its name suggests, the Alen BreatheSmart FLEX is designed for flexibility. The sleek and popular Alen FLEX is simple to use, featuring intuitive controls and easy filter changes all at a price that will give you peace of mind. Alen offers four different HEPA air filters to meet your clean air needs. All four remove dust and allergens, but each is uniquely designed to combat other airborne concerns, from mold to pet dander to smoke and more.