High Quality Construction & DesignTop of the line, Thick Wall Fiberglas Housing.Heavy Duty pulley and shaft system with minimal airflow restrictionHeavy Duty pulley and propeller mounting with high quality bearing assemblyAluminium frame shutter assemblyStainless steel hardwar.Self-adjusting belt tensioner.High PerformanceSmooth airflow-optimized shape design.Smooth finish inside & outside for improved air performanceAnd easiness to cleanHigh Efficiency Energy Saving 3 phase motorExhaust cone for improved performances.Effcient 6 propeller aluminium/magnesium ALLOYQuiet & Etended OperationQuiet operation: 300 PRM at maximum spped.Fully Variable speed.Used with a VSD (Vatiable Speed Drive) allows ramping on start and stop optimizinglife expectancy.Ectended year-round operation hours becacuse of high effiency and steady airflowat speed.Low annual operation cost.Techincal Specifications 53000cfm(90000 /hr)72'' (183cm),3HP(2.2KW)230/460Vac,3 phase.50 or 60 HZ.R.o.s producing area:CHINA