Agilent Technologies 7890A GC Safety Manual page 16

• Connect the µECD exhaust vent to a fume hood or vent it to the outside. See
the latest revision of 10 CFR Part 20 (including Appendix B), or the
applicable state regulation. For other countries, consult with the
appropriate agency for equivalent requirements.
Agilent Technologies recommends a vent line internal diameter of 6 mm
(1/4-inch) or greater. With a line of this diameter, the length is not critical.
16 7890A GC Safety Manual