... Product Description Features:1.The features of the ball spout FK-QP are long-distance air supply with less noise,which ... can be installed in the round duct.The ball spout FK-QP is mainly used in the area where the a ... electrically adjusted within ±30degrees.Inner packing:100,125,160,200,250,315,400,500Outer packing:100,125,160,200,250,315,400 ...