[Jeff Pahl]

I'll throw my opinion in here (and as I am the LRI at your week 1 event, you may want to know what it is..... )

Removing the bolts on the compressor, installing your bracket (which is very nice, by the way) and then re-installing the bolts, is a no-no.

There is a simple test for if something relating to "modifying" a pneumatics component is allowed: Did you pick up a tool? If so, it's probably not allowed unless it's on the specific list in R-65. R-65c allows you to assemble components together, such as installing a COTS threaded coupling into a threaded orifice in the COTS cylinder. If you are claiming you are assembling pneumatic components under R-65c, then R66 lists the allowed components, and your fan bracket is not listed. So R-65c does not apply.

I highly recommend mounting a legal fan next to the compressor, my team does that most years. Not sure why an inspector would have required a team to remove a fan. That's one of those situations where you should always respectfully and graciously request a second opinion from the LRI at the event.