Building an Su-27 which has all kinds of louvers, and couldn't figure out how to replicate them in small scale. I went to Lowe's today and in the roofing area they had vent louvers of different sizes. Found an aluminum Wall Louver about 14" X 24" which has row after row of tiny louvers on the underside. By cutting them out, I can get 'panels' of louvers about 2" long X 1 3/8" wide, or any combination of lengths. The louver cost me $10 and change for probably 50 small scale louvers!