Section 3 - Blow-Offs 3-1 2" Blow-Off Assembly (05/08/18)3-2 2" Blow-Off Assemblies Type B & C (03/25/11)3-3 4" & 6" Blow-Off Assemblies Type A (06/06/14)3-4 4" & 6" Blow-Off Assemblies Type B (12/02/99)