Fan housing and shutters made from highly galvanised Steel sheets in order to assure highest strength. Propellers made from Stainless Steel. Individually tested motor for quality control. Statically and dynamically balanced Propellers. Maintenance free Shutter bearings. Shutter opening is not affected by the weight of dust deposited on shutter blades. Shutters remain firmly closed when the fan is not operating. Every fan is individually checked for quality. Can be used for various applications like poultry farms, industrial buildings and green houses.