Greentek EMF 990, Инструкция по эксплуатации

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9. According pic.11, calculated the length of the angle iron, 24pcs M4*10 big
flat screws and M4 nut with gasket will be used to connect the angle iron
and another angle iron ( the overlap length of angle iron not less 100MM).
See pic.10.
10. Use 6pcs of M4* 10mm big flat screws to fix the angle iron on the hood
and install the extensible pipe. See pic.11/12.
11. Use the fixation board to put on the 3pcs of angle iron, 24pcs M4*10 big
flat screws and M4 nut with gasket will be used to connect the angle iron
and fixation board. See pic.13.
The total height of angle iron