FYI: When do you sprinkler Closets
in Dorms, Apts, Condos?
By James E. Art, Fire Protection Engineer
Q. “Do you need sprinklers in the Closets in Dormitories,
Apartments, Condos, Nursing Homes, etc.?
A. Per NFPA 13 (2016)the answer is “Yes - Always.”
Some Code Excerpts of interest:
Excerpts below are from NFPA 13 (2016 edition), currently enforced in California.
Note that an asterisk (“*”) indicates information in the Annex.
4.1 Level of Protection
A building, where protected by an automatic sprinkler system installation, shall be provided with sprinklers in all areas except where specific sections of this standard permit the omission of sprinklers.
Here is one such exception:
18.104.22.168* Closets and Pantries. Sprinklers are not required in clothes closets, linen closets, pantries within dwelling units in hotels and motels where the area of the space does not exceed 24 sq. ft … and the walls and ceilings are surfaced with noncombustible or limited combustible materials.
Note that this exception is different for hotels and motels than for other residential occupancies. More combustibles may be expected where more extended occupancy is likely, such as dormitories, apartments, condos, live-work, etc. The 2013 Edition of NFPA 13 included a 3 foot least dimension requirement no longer in the Code.
(Here is a different exception for Hospitals, but not nursing homes, see below)
8.15.9* Hospital Clothes Closets.
Sprinklers shall not be required in clothes closets of patient sleeping rooms in hospitals where the area of the closet does not exceed 6 sq. ft, …, provided the distance from the sprinkler in the patient sleeping room to the back wall of the closet does not exceed the maximum distance permitted by 22.214.171.124.
And note the fire sprinkler does not have to be centered:
126.96.36.199 Closets. In all closets and compartments, including those closets housing mechanical equipment, that are not larger than 400 ft3 … in size, a single sprinkler at the highest ceiling level shall be sufficient without regard to obstructions or minimum distance to the wall.
Clothes are mostly synthetic or blends. It is hard to buy pure cotton or natural materials. And clothes burn hot, fast, and fiercely.
One demonstration: In 1981 researchers used houses near the LA Airport scheduled for demolition, to run actual fire tests to try to help justify the NFPA 13D parameters for a less costly residential system. The system was called a Life Safety System, with a smaller meter, and fewer sprinklers in some areas. They hoped the sprinklers in the larger room would keep a fire in an unsprinklered closet from spreading. They filmed the fires.
One test was a closet fire, with typical clothing on hangers. As the fire started to take off, you can see lots of heavy dark smoke billowing out the top of the door opening, that later become burning gases, like the fire you see extending out of a window in a burning building.
Then you can tell that the camera operator is retreating, getting out of there!
Pretty soon he’s outside the building, filming thru the open door! It was clearly not safe in the room.
They had to call in the fire fighters standing by, to save the building, so they could use it again for more tests!
They did run another test with every fifth clothing article made of wool, and had a much slower fire.
The answer to this question may be different if NFPA 13D or NFPA 13R are appropriate. Those standards are intended mainly to allow occupants to escape (hence the term “Life Safety Systems.”) Property protection and fire extinguishing are secondary.
In the California Fire Code, based on the International Fire Code, most of the many important fire sprinkler trade offs such as extra stories or height, increased areas, increased travel distances, reduced fire alarm installations, etc. require the sprinkler system to meet NFPA 13.
Excerpt from CaFC (2016):
903.3.1.1 NFPA 13 sprinkler systems. Where the provisions of this code require that a building or portion thereof be equipped throughout with an automatic sprinkler system in accordance with this section, sprinklers shall be installed throughout in accordance with NFPA 13 as amended in Chapter 80 except as provided in Sections 903.3.1.1.1 and 903.3.1.1.2.
903.3.1.1.1 has exemptions for certain areas, including elevator machine rooms.
903.3.1.1.2 allows omission of sprinklers in certain occupancies in bathrooms less than 55 sq. ft, provided the walls and ceilings are non combustible or limited combustible with a thermal rating.
About the Author:
James E. Art is a Registered Fire Protection Engineer with over 25 years of experience. A graduate of the Illinois Institute of Technology Fire Protection Engineering program, he does Expert Witness work; Design Review, and Inspections for cities, architects, engineers; Code Consulting; High Piled Storage Reports; Alternate Means and Methods Requests; Hydraulic Calculations; and Design of Fixed Fire Extinguishing systems. You may contact him in California by phone at 925-846-5060
A similar version of this article was published in the Oct 2017 Fire Protection Contractor magazine, visit their website at www.fpcmag.com