Structure and principles：

The FF-D Fan is mainly composed of a blade, motor,outer frame protecting nets and supporting frames and shutters.Themotor drives blade to cause air flow and shutters can open and close automatically to keep the dust from entering. The majoparts are made of galvanized steel sheets and stainless steel sheets.

Main technical parameters：

Main performance characteristics：

Fan Bearingadopts imported doubie-row bearings with special waterproof design,ensuring water does not enter.,Exhibits high strength,lower noise,is maintenance free and has a long service life.

Fan Blade:composed of Krupp stainiess steel,made by punch forming.ensuring no dust. Aftractive anddurable. Thesoecial bltade shape design ensures large air volumes, no deforation and a continuous,consistent rate of airflow.

Motor both Chinese famous motors and Siemens motors are available. Motor voltage and frequency may becustomized.The Chinese famous motors are especially designed for the fan,and is the first of its kind withprotection device which couldpower off during a shortage of electricity. Motor protection grade: 1P55; Insulation class: Grade F

Fan Bell Pulley. composed of high strength aluminum-magnesium alloy by die-casting which reduces the weightof theblade impeller and provides i with complete,high corrosion resistance. It utilizes a special "three reinforcedribs pulley"design. Blast-sanding treatment is done to provide an artractive appearance,as wellas eliminate intemalstress,improvingts own rigidity and stability to minimize breakage.

Belts: imporled belts that exhibit long service ile,ensuring minimal maintenance.

Drop Hammer: using high strength nylon,this swung drop hammer opening device ensures the flexibility of the opening and closing of the shutters.