MK Plastics Venturi IO&M - Manual (Page 6)

6
Auxiliary Washing Rings
As part of the Perchloric Acid Exhaust System, M.K. Plastics supplies (if required) auxiliary washing rings for both
vertical and horizontal sloping duct runs from the Venturi stack to the fume hood. The auxiliary washing rings should
be located every 10’-12’ on vertical ductwork and every 4’-5’ on the horizontal ductwork. See Fig. 7 for typical detail of
the auxiliary washing rings. Spray nozzles (similar to the spray nozzle on the Venturi stack) should also be installed
up and down stream on each elbow. It is recommended, however, that the Venturi stack should be located as close
as possible to the perchloric fume hood, without elbows and horizontal duct runs.
Fig. 7 – Auxiliary Washing Rings