Reinforcements

Rectangular Reinforcements

AMDP uses two types of duct reinforcement, internal tie rods & external angle reinforcements, located at duct joints and mid-panel on duct and fittings per SMACNA standards. We use tie rods when warranted unless otherwise requested.

Tie Rods

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Angle Reinforcements

Reinforcements must be fastened (tack welded, spot welded, riveted, screwed, or bolted) at 8” intervals maximum. When ends are tied, the 3/4” interval may be omitted. When reinforcements occur at the same location on adjacent sides at 4” W.G. (1000 Pa.) static and greater, tie the ends. 4.5

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