... Conformed to the prescription of GB11799-89 MARINE EXPLOSION-PROOF FAN TESTING, TECHNIC DEMAND, CHECK AND ACCEPT.2.2. ... (Q>0.5), high efficiency (η>65).3.2. Light in weight, small in size, reliable in operation, low ... resistance against swing, vibration and impact.Centrifugal fan,Ventilation fan,Centrifugal ventilator,Ventilating fan,Exhaust fan,Air blower,Centrifugal blower,Wind blower,Marine ...