Eve001,
Running the duct from the ESB Pole to the cabinet is your responsibility as is installing the pull chord. I installed the duct/pull chord myself for my house and I am am currently waiting on the ESB to come out (next week hopefully) and do ths same for me. The guy you have doing this for you should have known well about the pull chord.
The way around this is to get some 1/2 in flexible pipe (eg 1/2in qualpex) and run this through the duct. Attach the pull chord to the end of the pipe and then pull it through.