"MATERIAL:STEEL,CARBON;ASTM A366,A109 OR A569; 0.747 IN THK SHEET OR 0.083 IN THK STRIP. O/A LG 26.940 IN MINAND 27.060 IN MAX; O/A HT 15.940 IN NOM. CONSISTS OF 8 MOUNTING SLOTS; DIM. 0.380 IN BY 0.620 IN.; 666 SLOTS FOR VENTILATIONS MEASURING 0.250 IN. BY 1.000 IN. FOR ADDITIONAL INFORMATION REFER TO DRAWING"