China factory Wall Mount Galvanized Steel Exhaust Fan Swung Drop Hammer Exhaust Fan for Modern Greenhouse Ventilation pulley assembly

Fan blades

1. Material : 430 stainless steel, thickness 1.2mm
2. Diameter: 1270mm
Advantage: 
Large air flow, no deformation, no fracture, no dust, attractive and durable.
Note:
Blade material also have galvanized sheet, aluminum alloy for option

Belt Pulley

1. Material: High strength aluminum-magnesium alloy by die-casting.
2. Blast-sanding treatment, eliminate internal stress to improve its own rigidity and stability

Advantage:
Light weight, Low vibration ,attractive appearance.

Opening System

1.Material: High quality Nylon PA66
2.Xihu (West Lake) Dis. Rod: 304 stainless steel with special material outside, high strength, no rust, reduce friction.
3.Rivet: 304 stainless steel , wear-resisting, no rust.
Advantage:
It can keep the shutters open at complete 90 degree to ensure the lowest air resistantce and biggest air volume.

New type sealing rotational device

Material : Nylon PA66

Advantage:
Improve the efficiency by 30%

Shutters

1.Shutter quantity: 11pcs

2.Sheet thickness: 0.8mm

Advantage:
Shutters are improved to 11pcs in small size from old 8pcs big type, which facilitate the shutters’ opening and closing.

Belt

Brand: Mitsuboshi belt (Japanese)
Type: B type, B88

Advantage:
B type belt is 3 times longer service life than A type belt, maintenance free.

New designed shutter fixed clips

1.New double layers shutter fixed clips get a firmer installation and better sealing.

2.The friction coefficient between fixed clips and rotational arm is much smaller.

Advantage:

The new design gets the shutter a better sealing and a flexible opening and closing.