Critical speed(m/s) 1.25 2 2.5 3 3.5 4 Braking power(J) 750 800 830 874 900 930 Resistance work(J) No more than35 No more than 35 No more than 40 No more than 40 No more than 45 No more than 45 Lift height(mm) No more than 8 No more than 8 No more than 8 No more than 8 No more than 8 No more than 8
