... -direction, air can be well-distributed PLASTIC 4-WAY PLENUM aluminium blade Characteristics1,Suitable for eco-cooler for vertical air ... with it’s good properties for guide the wind, blade can manual adjustment, and the border coupling through core, ... don’t loose, easy for maintenanceSpecification SpecificationPlenum 4-waysCabinet(mm)895x895x290Blade(mm)536*244*30 PLASTIC 4-WAY PLENUM aluminium blade