How to remove a gable vent (22" octagonal)?

[KG7BJM]

If that contractor says that it will not allow attic access, it's probably because the snap on piece is a simple trim ring, meant to hide the rough edges of the siding, and the louvers are attached to the nailed on section.  I've seen that--trim rings to hide edges only--before, although not on the type gable vent you describe, which I haven't seen.

Now it makes sense what the guy told me: only the trim "ring" will come off, not the center piece. He mentioned the rough edges of the siding and I couldn't understand why this would still not give access to the attic.

BTW, "access" was only for my left (or right) arm, not my whole self.

So now it is going to be kneepads on, nose covered, and then: no venture, no (antenna) gain. Ugh!

[AA4PB]

I can almost stand up straight and walk down the center of my attic. Make sure you step from joist to joist and don't step down onto the drywall that is under the insulation. Also do it while the weather is cool or at night.

[N4CR]

Also do it while the weather is cool or at night.

This man speaks the truth unless you live in the northern climates. I was in my attic in Florida on a mid February afternoon and I  was soaked when I came down. In the summer, I won't go up there after sunrise.