Air Filter Access

[Steve Sherman]

Probably a dumb Q, but here goes anyway.  Was doing my general maint,
(oil and filter change) on the 91 avant for the first time, when I
realized that I did not know exactly how to get at the air filter.  I've
done quite a few air filters on the 10v units, and while this looks
easier, it was not clear to me what if any of the sheilds one needs to
remove to get at the air filter.

Could someone who knows tell me what to remove (or not) in getting to
the air filter on these.

TIA