87 PT40 Radiator/Battery Covers

[mrkane]

Today I lost another slat from the louvered covers over the engine radiator and battery compartment. I have been considering changing to either expanded metal or perf-metal, <http://www.stainlesssteelblog.com/2013/08/perforated-stainless-steel-plate.html>, but have questions:

For appearance, obscuring the interior of the engine spaces using the smallest holes would be preferred. How does one select an opening size to give airflow comparable to the original louvers?

I would paint the new panels to match the coach, but would prefer stainless or aluminum for corrosion resistance. There is also the concern about stiffness versus the need for bracing, and consequent weight issues.

One side is 52" wide by 43" tall, the other is 44" wide by 40" tall. A single 4'x8' sheet should be sufficient.

Anyone have a source for such materials? Suggestions?

(BTW, on my last visit to Colaw's salvage in MO, none of the birds had intact louvered covers, or any slats of sufficient length.)

Thanks--
M.R.Kane
1987 PT40 'Sleipnir'
currently near Terrell, TX