Connect the sterilizer/aerator to a dedicated vent line to exhaust ethylene oxide to the outside atmosphere or to an emission control system. The following requirements for venting the Steri-Vac 5XL gas  sterilizer/aerator must be met..
Ensure the vent line is constructed of straight lengths of copper tubing.
Do not extend the length of line beyond 91 .5m (300 ft). The diameter of the vent line depends on the length of the line. Refer to the table below for vent sizes. Use a 3/8 in National Pipe Threath(NPT) connection at the sterilizer. The vent line contains significant amounts of EQ during the final purge phase. Do not terminate the vent line within 7.6 m (25 ft) of any possible source of ignition or any opening to the building interior such as fresh air inlets, unsealed windows or pedestrian traffic areas.

Install a moisture trap if there are more than three meters (ten feet) of vertical distance in the vent line. Route the vent line so that moisture drains toward the trap. Avoid sags or loops in the vent line to prevent moisture buildup at other points in the line. Ensure that the vent line is gas-tight from the machine to the outside atmosphere. Use flanged or compression fittings at the sterilizer and the moisture trap. Braze or solder all the other vent line fittings .Keep all of the vent line, with the exception of a turned-down extension terminating on the roof top or exterior wall, inside the building. This is to prevent moisture from freezing in the line and blocking the vent. (See the diagram of vent line terminations in Figures 2 and 3.