I own a rental townhouse in a complex where the builder did not put in
A/C units. The location for the A/C units, for those that wanted them,
is under a wooden deck that has about 5 feet of height underneath. The
underside of the deck is enclosed on three sides with siding, and on the
fourth side is the building.

The problem is that as people have added A/C units, they've cut openings
of various sizes and shapes in the siding, and covered the openings with
wire mesh. It looks terrible, and these homeowners will be paying for
the replacement of the siding.

The question is how to replace the siding and how to include venting
that is not unsightly. A long time ago we were having problems with
moisture under the decks, and installed 24" high x18" wide aluminum
vents in the siding, and painted them to match, and it looked fine, but
these vents don't let in enough air, or let out enough exhaust, for an
air conditioner, so whoever installed the air-conditioner removed them.

I was thinking of some large louvered vents made out of aluminum, like
24" high x 48: wide that we can paint to match, but I can't find
anything like that. I can do three 24" x 18" side by side, on each side
of the deck, but that is a lot more work.

I know that I can order custom extruded aluminum louvers in any
dimensions, but I'd like to stick with standard products.