Roger W. Griffith, P.E.

NFPA 13R Sprinkler Systems – Are You Double-Dipping?

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Sprinkler system riser

For residential occupancies, a 13R sprinkler system is permitted by the building codes for many applications, and a 13R system offers numerous economic advantages for the building owner. Most notably, with a 13R system, attics and concealed spaces do not have to be protected with sprinklers.

But, be careful! Although the building codes permit a 13R system for residential occupancies, a 13R system is not permitted when a 13 system is used by the Architect for tradeoffs to other code requirements.

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Floor Registers in Commercial Buildings

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HVAC floor register

Commercial buildings typically have ceiling diffusers or sidewall grilles, but occasionally there is a need to locate air supplies or returns on the floor of a facility. Floor registers are common in residential applications. Before locating them on the floor a commercial building, a careful review of the applicable codes is imperative.

Building codes typically do not prohibit floor registers in commercial buildings, however, the fire codes can restrict their usage. For example, NFPA 101: Life Safety Code, paragraph 9.2.1 states that “Air-conditioning, heating, ventilating ductwork, and related equipment shall be in accordance with NFPA 90A.” NFPA 90A: Standard for the Installation of Air-Conditioning and Ventilating Systems, paragraphs 4.3.7.3.1 and 4.3.8.3.1 state that “Air inlets/outlets shall be located at least 3 inches above the floor, unless provisions have been made to prevent dirt and dust accumulations from entering the system.”

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Roger W. Griffith, P.E.
P.O. Box 702
Jefferson City, TN 37760
(865) 471-8142

Email: rgriffith@griffithengineering.net

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