Is designed for its simplicity. With a 0-60 timed and an ozone output fixed at 300mg/hr, the user can deodorize a 300 sq ft room in just 15-20 minutes, with simple flick of a switch. This is the recommended unit for hotels, condo owners, nursing homes, etc. All Queenaire models have 5 year warranty. Very effective in eliminating odors including tobacco smoke, human and pet odors, food odors, and much more.