(a)

1. (1) Air/vacuum relief valves provide a means for releasing air at the start of a dose cycle so the system will:

   1. (A) Charge quickly with wastewater; and
   2. (B) Allow air to enter the system quickly at the end of the dose cycle.

2. (2) Air/vacuum valves shall be located at the highest points of either:

   1. (A) Supply or return manifolds; or
   2. (B) Both.

(b)

1. (1) Air/vacuum relief valves shall be sized based on the proposed design flow rate.
2. (2) A valve that is undersized will not provide an adequate amount of airflow.