Ok with the limited information you gave in this opening post, it is very hard to give you an answer.
You know what a cloud is, but we have no idea of the area/system. If I have to guess it is the addition of the fans to the building because that is where it stops at.
In the future if you want information please provide a little more background information or clearer questions to get better answers. Otherwise you can expect some razzing because you are asking us to just make a guess or state the obvious.
Trouble with that is...I'm an engineer. Mechanical , but installed lots of projects with multiple trades. Any trade person, not necessary to be a foreman, could simply ASK me. . . anything. I would get it answered ASAP. This is WAY too much time spent circling around when a call to the owner's rep, engineer, or GC's rep would have solved it. It is apparent to me that the drawing revisor simply forgot to put in the note for modification #10. Besides that, SOMEthing should have been provided to the sub(electrical) specifically describing what is required to accomplish the job. NO work should be initiated by any sub without a job description included with the change order or RFQ.
You should not be wasting your time even considering this without such detail.
Just my opinion!