Specifications: Model ZDH30-2 ZDH30-2 ZDH30 ZDH20L ZDH20Q ZDH20Q Power (HP) 5 9 5.5 4 3.5 6.5 Rotate speed (r/min) 3600 3600 3600 3600 3600 3600 Vibrant frequency(HZ) 78 78 78 78 78 78 Exciting Force (KN) 30 30 30 20 20 20 Moving speed (cm/s) 25 25 25 20 20 20 Impaction depth (cm)/(inch) 50 / 19.5 50 / 19.5 50 / 19.5 30 / 11.7 30 / 11.7 30 / 11.7 Impaction efficiency (m2/h)/(sg.ft) 330 / 3548.5 230 / 2473.2 Exterior size (cm)/(inch) 130*42*90 130*42*90 130*42*90 115*34*85 115*34*85 115*34*85 50.7*16.4*35.1 44.9*13.3*33.2