Labels:text | screenshot | diagram | black and white | rectangle OCR: CUT, BEND AND NAIL DOWN 4 PIECES OF GALVANIZED STEEL SHEET TO FORM AN ENCLOSED TUNNEL FROM FRONT TO BACK THROUGH THE CENTER OPENING. SEAL THE INSICE CORNERS WITH SILICONE RUBBER CALLKING. COVER THE ENTIRE FRONT AND M3' REAR FACES WITH SHEETS GALVANIZED STEEL. OUUT OPENINGS OF IN IT AS SHOWN. THE CENTER CIRCLES ARE THE DIAMETERS TO INSTALL A COMMERCIALLY AVAILABLE FLLE PASS - THROUGH. USE SHEET METAL SCREWS INTO THE PLYWOOD TO INSTALL THEM. REACH THROUGH THE CENTER HOLE AND USE SILICONE RLEBER CAULK TO SEAL THE TUNNEL AROUND THE FACING SHEETS. T DAN JINCKS 1990
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