All corners are mitered at channel transitions. Three-inch channels or larger are paired with two-inch channels or smaller as indicated. Nonmetallic or nylon rivets fasten the assembly one inch from each end and at a maximum spacing of sixteen inches on center.
OR LARGER MITER ALL CORNERS OR SMALLER 3 IN. CHANNEL 2 IN. CHANNEL USE NONMETALLIC/NYLON RIVETS, FASTEN 1 IN. FROM EACH END AND EVERY 16 IN. (MAXIMUM) ON CENTER
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