The UV Pro 550 series ozone generators are designed for use as high output shock treatment tools. Ideal for use in hotels/motels, garbage compactors, light restoration, auto detailing, etc. Comes equipped with 4" ozone output and fresh air input spouts. These "spouts" will hook up to a drier vent hose or other 4" hose. This allows the installer to route clean air into the ozone generator or route the ozone to where it is needed.