from vertical movement" was how the correction read. The vent is attached to a direct vent tank-less water heater. I may be overstepping but I usually see a strap which in this case would have been wrapped around the pipe just below the elbow and secured to a rafter.
This is what was done. The HO is upset with me.

uh oh! this should have been in the plumbing forum
This is what was done. The HO is upset with me.

uh oh! this should have been in the plumbing forum
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