[RE-wrenches] Plumbing/Mechanical Code for obstructions above plumbing vents

[Bruce Leininger]

Hello.  I'm wondering if there is a code reference for the allowable
clearance above a plumbing vent.  I've run into several jurisdictions that
ask for the clearance to be at least 2x the diameter of the vent pipe.  I'm
wondering if there are any code references to back this up or any code that
specifically prohibits obstructions (like solar panels) above plumbing
vents.

Thanks all!

Bruce
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