There are a handful of rules in NFPA 13 covering how sprinkler protection works in and around obstructions. It's for good reason; we don't want objects getting between a growing fire and our best method of suppressing it.
The PDF cheatsheet this week covers options for throwing water below obstructions, where the top of the obstruction is at or above the sprinkler deflector, for standard pendent and upright sprinklers.
If the sprinkler deflector has the ability to throw over the top of an obstruction - different rules apply - which we'll get to in the coming weeks.
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As always, any tips, ideas or feedback feel free to send my way at firstname.lastname@example.org. Hope you find this helpful and that you have a great & safe week!
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Joe Meyer, PE, is a Fire Protection Engineer out of St. Louis, Missouri who writes & develops resources for Fire Protection Professionals. See bio here: About