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� <br /> � <br /> � <br /> � <br /> � <br /> IK. Do not exceed 20 degree angle of slope for decrease-in-area <br /> • i <br /> transitions. <br /> ; <br /> � L.. Do not exceed 30 degrees on the entering side or 45 degrees on the <br /> � leaving side for angle of transitions at connections to equipment <br /> ; without the use of approved vanes. 20 de�ree angle is preferred <br /> � and should be used space permittin;. <br /> IM. Provide Elbows fabricated to one of the following requirements in <br /> I order of preference: <br /> � <br /> ; 1. Unvaned elbow with the throat radius equal to 3/4 of the <br /> i width of the duct and with a full heel radius. <br /> i <br /> I <br /> � 2. Six inch throat radius with full radius, single thickness <br /> vanes and full heel radius. Maximum unsupported length of <br /> � vanes shall be 36". Vanes shall be securely fastened to <br /> runners. All vanes shall be secure and stable in installed <br /> operating position. Construct vane edges to project tan�ents <br /> parallel to duct sides. <br /> 3. Square elbows with single thickness turning vanes. <br /> • Maximum unsupported len�th of vanes shall be 36". Vanes <br /> shall be securely fastened to nu�ners. All vanes shall be <br /> secure and stable in installed operating position. Construct <br /> vane edges to project tangents parallel to duct sides. <br /> 4. Radius elbows are the preferred fitting. Square elbows are <br /> I to be used only when available space prevents the use of <br /> radius elbows. <br /> , <br /> N. Provide offsets as necessary in accordance with SMACNA. <br /> ' O. Make branch connections and tees in one of the following <br /> manners: <br /> � l. Converging radius elbow with Manual Volume Damper <br /> � (MVD). <br /> � 2. 45-degree entry with MVD. <br /> 1 <br /> � 3. Round spin-in fitting with MVD. <br /> ,+ <br /> � <br /> • P. Space duct joints to avoid cutting them for branch take offs and <br /> outlet collars. <br /> ICT 99134 <br /> 15890 - 5 <br />