... wind in multi-direction, air can be well-distributed PLASTIC 4-WAY PLENUM aluminium blade Characteristics1,Suitable for eco-cooler ... direction, air can be well-distributed2,Mushroom Plenum use ABS plastic injection molding and secondary processing using high precision CNC machine ... rim of Plenum is made of galvanized sheet material, with mould stamping forming, it’s size precision and intensity is ...