- Where areas are not physically separated by a draft curtain, barrier, or partition capable of delaying heat from a fire in one area from fusing sprinklers in the adjacent area, the required sprinkler protection for the more demanding design basis shall extend 15 ft (4.6 m) beyond its perimeter.
- The requirements of 11.1.2(1) shall not apply where the areas are separated by a draft curtain, or barrier located above an aisle, where the aisle has a minimum 2 ft (600 mm) horizontal separation from the adjacent hazard on each side, or a partition that is capable of delaying heat from a fire in one area from fusing sprinklers in the adjacent area.?
- The requirements of 11.1.2(1) shall not apply to the extension of more demanding criteria from an upper ceiling level to beneath a lower ceiling level where the difference in height between the ceiling levels is at least 2 ft (600 mm), located above an aisle, where the aisle has a minimum 2 ft (600 mm) horizontal separation from the adjacent hazard on each side.
- The water supply requirements for the highest hazard classification within the system shall be used.
- The water supply requirements for each individual hazard classification shall be used in the calculations for the design area for that hazard.
- *For systems with multiple hazard classifications where the higher classification only lies within single rooms less than or equal to 400 ft (37 m2) in area with no such rooms adjacent, the water supply requirements for the principal occupancy shall be used for the remainder of the system.
- A total water allowance of 50 gpm (190 L/min) for a single hose connection installation shall be added to the sprinkler requirements.
- A total water allowance of 100 gpm (380 L/min) for a multiple hose connection installation shall be added to the sprinkler requirements.
- The water allowance shall be added in 50 gpm (190 L/min) increments beginning at the most remote hose connection, with each increment added at the pressure required by the sprinkler system design at that point.
- The sprinkler system demand shall not be required to be added to standpipe demand as determined from NFPA 14.
- Where the combined sprinkler system demand and hose stream allowance of Table 184.108.40.206.2 exceeds the requirements of NFPA 14, this higher demand shall be used.
- For partially sprinklered buildings, the sprinkler demand, not including hose stream allowance, as indicated in Figure 220.127.116.11.1 shall be added to the requirements given in NFPA 14.
- The maximum fan diameter shall be 24 ft (7.3 m).
- The HVLS fan shall be centered approximately between four adjacent sprinklers.
- The vertical clearance from the HVLS fan to sprinkler deflector shall be a minimum of 3 ft (0.9 m).
- All HVLS fans shall be interlocked to shut down immediately upon receiving a waterflow signal from the alarm system in accordance with the requirements of NFPA 72.
- Light hazard
- Ordinary hazard (Groups 1 and 2)
- Extra hazard (Groups 1 and 2)
- Special occupancy hazard (see Chapter 22)
|Occupancy Classification||Minimum Residual Pressure Required||Acceptable Flow at Base of Riser (Including Hose Stream Allowance)||Duration (minutes)|
- Additions or modifications to existing pipe schedule systems sized according to the pipe schedules of Section 23.7
- Additions or modifications to existing extra hazard pipe schedule systems
- New systems of 5000 ft2 (465 m2) or less
- New systems exceeding 5000 ft2 (465 m2) where the flows required in Table 18.104.22.168 are available at a minimum residual pressure of 50 psi (3.4 bar) at the highest elevation of sprinkler
- Density/area curves of Figure 22.214.171.124.1 in accordance with the density/area method of 126.96.36.199
- The room that creates the greatest demand in accordance with the room design method of 188.8.131.52
- Special design areas in accordance with 184.108.40.206
FIGURE 220.127.116.11.1 Density/Area Curves.
Table 18.104.22.168.2 Hose Stream Allowance and Water Supply Duration Requirements for Hydraulically Calculated Systems
|Occupancy||Inside Hose||Total Combined Inside and Outside Hose||Duration (minutes)|
|Light hazard||0, 50, or 100||0, 190, or 380||100||380||30|
|Ordinary hazard||0, 50, or 100||0, 190, or 380||250||950||60—90|
|Extra hazard||0, 50, or 100||0, 190, or 380||500||1900||90—120|
- *For areas of sprinkler operation less than 1500 ft2 (139 m2) used for light and ordinary hazard occupancies, the density for 1500 ft2 (139 m2) shall be used.
- For areas of sprinkler operation less than 2500 ft2 (232 m2) for extra hazard occupancies, the density for 2500 ft2 (232 m2) shall be used.
(B)The term adjacent shall apply to any sprinkler system protecting a space above, below, or next to the qualifying concealed space except where a barrier with a fire resistance rating at least equivalent to the water supply duration completely separates the concealed space from the sprinklered area.
- Noncombustible and limited-combustible concealed spaces with minimal combustible loading having no access. The space shall be considered a concealed space even with small openings such as those used as return air for a plenum.
- Noncombustible and limited-combustible concealed spaces with limited access and not permitting occupancy or storage of combustibles. The space shall be considered a concealed space even with small openings such as those used as return air for a plenum.
- Combustible concealed spaces filled entirely with noncombustible insulation.
- *Light or ordinary hazard occupancies where noncombustible or limited-combustible ceilings are directly attached to the bottom of solid wood joists or solid limited-combustible construction or noncombustible construction so as to create enclosed joist spaces 160 ft3 (4.5 m3) or less in volume, including space below insulation that is laid directly on top or within the ceiling joists in an otherwise sprinklered concealed space.
- Concealed spaces where rigid materials are used and the exposed surfaces have a flame spread index of 25 or less and the materials have been demonstrated to not propagate fire more than 10.5 ft (3.2 m) when tested in accordance with ASTM E84, Standard Test Method for Surface Burning Characteristics of Building Materials, or ANSI/ UL 723, Standard for Test for Surf ace Burning Characteristics of Building Materials, extended for an additional 20 minutes in the form in which they are installed in the space.
- Concealed spaces in which the exposed materials are constructed entirely of fire-retardant-treated wood as defined by NFPA 703.
- Concealed spaces over isolated small rooms not exceeding 55 ft2 (5.1 m2) in area.
- Vertical pipe chases under 10 ft2 (0.9 m2), provided that in multifloor buildings the chases are firestopped at each floor using materials equivalent to the floor construction, and where such pipe chases contain no sources of ignition, piping shall be noncombustible, and pipe penetrations at each floor shall be properly sealed.
- Exterior columns under 10 ft2 (0.9 m2) in area formed by studs or wood joists, supporting exterior canopies that are fully protected with a sprinkler system.
- *Light or ordinary hazard occupancies where noncombustible or limited-combustible ceilings are attached to the bottom of composite wood joists either directly or on to metal channels not exceeding 1 in. (25 mm) in depth, provided the adjacent joist channels are firestopped into volumes not exceeding 160 ft3 (4.5 m3) using materials equivalent to 1/2 in. (13 mm) gypsum board, and at least 31/2 in. (90 mm) of batt insulation is installed at the bottom of the joist channels when the ceiling is attached utilizing metal channels.
- Wet pipe system
- Light hazard or ordinary hazard occupancy
- 20 ft (6.1 m) maximum ceiling height
- No unprotected ceiling pockets as allowed by 8.6.7 and 8.8.7 exceeding 32 ft2 (3.0 m2)
- No unprotected areas above cloud ceilings as allowed by 8.15.24
For dry pipe systems and double interlock preaction systems, the area of sprinkler operation shall be increased by 30 percent without revising the density.
- Light hazard — Nonrated automatic or self-closing doors.
- Light hazard with no opening protection —Where openings are not protected, calculations shall include the sprinklers in the room plus two sprinklers in the communicating space nearest each such unprotected opening unless the communicating space has only one sprinkler, in which case calculations shall be extended to the operation of that sprinkler. The selection of the room and communicating space sprinklers to be calculated shall be that which produces the greatest hydraulic demand. For light hazard occupancies with unprotected openings in walls, a minimum lintel of depth of 8 in. (200 mm) is required for openings and the opening shall not exceed 8 ft (2.4 m) in width. It shall be permitted to have a single opening of 36 in. (900 mm) or less without a lintel, provided there are no other openings to adjoining spaces.
- Ordinary and extra hazard — Automatic or self-closing doors with appropriate fire resistance ratings for the enclosure.
- In accordance with minimum flow rates indicated in the sprinkler listings
- In rooms or compartments greater than 800 ft2 (74.3 m2), calculated based on delivering a minimum of 0.1 gpm/ft2 (4.1 mm/min) over the design area in accordance with the provisions of 22.214.171.124
- In rooms or compartments 800 ft2 (74.3 m2) or less calculated based on delivering a minimum of 0.1 gpm/ft2 (4.1 mm/min) over the room or the compartment using the area of the room divided by the number of sprinklers in the room