45 90Were to be applied applied to the 45 elbow duct is 90 elbow duct

摘要

the present design is 90 elbow 45 in the process of connecting the supply and exhaust ducts to the duct elbow duct by a 90 elbow duct to a simple cutting operation utilized as the traditional 45 elbow duct when necessary be to provide a 90 elbow duct to apply a 45 elbow duct to make. The subject innovation is the valve element (P) for connection to a plurality of units of the bent part (10,20,30) to form cut by cutting lines, each set to a circular shape while bending the bending joints (40) 90 elbow duct (L1) a to form, The unit of the bent part (10,20,30), forming of the extension in the width of the inner unit of the bending portion 30 which is located in a predetermined middle portion to the center in the middle of a pre-cut line 32 formed in a groove form both sides by at a distance form each beading (31) 90 elbow duct (L1) is cut along the pre-cut line 32 to be used by two 45 elbow duct (L2), such as a conventional 45 elbow duct formed in the so as to provide the feature. ;