TM 5-814-3/AFM 88-11, Volume III
E-5. Insulation of appurtenances.
Trash racks, bar screens, grit chambers, unit-process tanks, biological reactors, aerators, gates, walkways
and instrumental sensing devices must be heated or insulated or redesigned to withstand icing and snow pack.
Additional information may be found in TM 5-852-1/AFR 88-19, Volume 1; TM 5-852-4/AFM 88-19,
Chapter 4; and TM 5-852-5.