Thanks to Colbyt for the reply.

He said: I would suggest you avoid the roof if at all possible. Not saying you
aren't, but even professionally installed units tend to have problems.
They
always leak. And in a building that age no telling what you might
encounter.

You are right to say the roof is worth avoiding and this may be why
Greg says he wants to go through the wall. If it becomes absolutely
necessary to go through the roof then I may not feel confident taking
the job cause when it leaks I will look like a jerk. The problem as I
currently see it is that there does not seem to be enough room outside
to go through the wall . The neighboring building is almost flush to
the co-op. There may be about 12 inches between them. I will get
permission to go up on the roof and check it out in more detail. I
will also post pics from the roof when they are available. Don't you
think it would be necessary to access the wall from the outside in
order to fit the end cap to the flue?

He also said: Based on the images it doesn't look like "big city
standards" are being
enforced since I see residential equipment in a commercial location. I

suspect you will be able to get away with installing a better grade
residential unit. A "big city" install would require a commercial unit
and
make up air with built in fire extinguishers installed by a certified
installer.

LOL, that is a good way to put it. I tried and tried to explain that
to everyone so maybe these pics have turned out to be useful after all.
I agree that a "commercial style" residential unit will suffice and I
plan to suggest it to the boss man. I seriously doubt if they will
require us to intall a true commercial unit.

He also said: The motor as a remote mount will greatly reduce the noise if that is an
option.

Now that is an interesting idea that I hadn't thought of. I was
visualizing the fan and motor as intregal to the hood. Can you
describe in more detail your ideas conerning a remote mount. That is:
would the fan and motor be intregal ? Or would the fan operate the fan
via a belt? Or is it something else you are describing?

He also said: If I were you I would go with your original plan to ask the inspector what
you need to do and never offer any suggestions. The absolute minimum
will be
a safe install unless they start frying a bunch of stuff on that stove
top.

From what I understand, it is not the building inspector who is
requiring the hood but the health department which is quite different.
For sure this is the most common suggestion i have received and I will
ask Greg if he plans to do that. I am guessing that we will not even
bother with permits or inspectors but I plan to check. My guess is that
he just wants to see a hood that works since it is a small town
friendly situation.

Lawrence