Rev D: Minor corrections, plus:
DIR 18-38: Added new vendor to vent systems contractors in
Massachusetts, Section 2.12.1.
DIR 19-03: Added “International” option to Section 2.10 AC
Electrical Power Wiring.
DIR 19-04: Added additional requirements to Section 1.2:
Emergency Shutdown.
DIR 19-15: Added requirement that the housekeeping pad
must be level (Section 2.4.2)
DIR 19-35: Clarified Isolation Valve operation, added Isolation
Valve harness wiring table, Section 2.14.