• Why do I need an air purifier? • What is the difference between the Summit & Cloud? • Are your air purifiers simple to operate? • Why are so many stages of purification needed? • How often should I run my air purifier? • Will your air purifiers work on my whole house? • Which features should I run daily? • What is the maximum coverage for each unit? • Are your air purifiers cheap to run? • Where is the best location for my air purifier? • How quiet are your air purifiers? • Are multiple air purifiers better for severe allergies? • How big is each purifier? • What does the Sterilization feature do? • Do the filters need to be replaced? • What does the Anion feature do? • Which two filters are washable? • How do I use the PURIFY feature? • Which two filters are to be vacuumed only? • How do I use ozone safely? • How often should I clean each filter? • Is ozone required to eliminate smoke odor?