On Apr 6, 4:36*pm, Aaron FIsher wrote:
The three-foot tall, four-feet long sheet steel fabricated around my
chimney is falling apart so I took it down.

All that is sticking up out of the chimney itself are the elaborate spark
arrestors (multiple chimneys use the same concrete column) which look
like 18" tall space ships sticking out of the top of the chimney.

I realize the cap I removed served an aesthetic purpose; but is that the
ONLY purpose?

That is, with the spark arresters (or whatever they are) sticking out of
the chimney still intact, what 'function' does the three-foot wide by
four feet by two feet painted steel chimney 'surround' cap perform?

A secondary question would be advice for fabricating a new one if it's
needed (it certainly would look better with it back on).

Post a photo, its there for keeping smoke away by being high. your
setup seems humerous, or dumb.