... industrial, greenhouse, poultry etc. 4. CE certificate Industrial 40' Window Mounted Wall Fan with CE Applications:1. Industrial fields: textile, socks ... printing, food stuff, processing, dyeing, laundry and other workshops with high temperature.2. Civil fields: net bars, stores, supermarkets, ... requiring no belts,no bearings to grease with high efficiency with no drive loss 6.Totally enclosed,maintenance ...