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Maximum Distance(Spacing) Between Sprinklers: composite wood joists**(Refer to Fig. 6) I 14 ft.(4.27 m)for concealed spaces that are less than 18" 4. Obstructed wood trusses; top chord more than 4" (457 mm)in depth. deep (Refer to Fig. 7). 16 ft.(4.88 m)for concealed spaces that are 18"(457 mm) **Note: In order to be considered "noncombustible insu- or more in depth lation-filled, solid wood or composite wood joists" Maximum Coverage Area Per Sprinkler: construction, the insulation (including insulation 196 ft2(18.2 m2)for concealed spaces are less than 18 in provided with a combustible vapor barrier), must (457 mm)in depth. completely fill the pockets between the joists to the 256 ft2 (23.8 m2) for concealed spaces constructed that bottom of the joists. Insulation installed above the are 18"(457 mm)or more in depth. elevation of Model KFR-CCS sprinklers in wood truss, solidwood joist or composite wood joist Note:Sprinkler spacing is determined by the depth of the must be secured into place with metal wire netting. concealed space at the location of the installation. The metal wire netting is intended to hold the insula- When transitions occur in the concealed space,the sprin- tion in place should the insulation become wet by klers may immediately be spaced at the largest approved the operation of Model KFR-CCS Sprinklers in the coverage area per the listing for the concealed space depth event of a fire. (Refer to Fig. 8) Concealed Space Area: Deflector Position: The area of the concealed space is not limited; however, At or below the bottom of the top chord; 1.5 in. (38 mm) for wood truss construction or concealed spaces of non- minimum to 4 in. (102mm)maximum below upper deck(or combustible bar joist construction(Refer to Fig.4)draft-cur- insulation if present)for wood truss construction or wood bar tains or full height walls must be provided at 1,000 ft2(93 m2) joist construction(Fig.2). areas.This draft curtain shall be at least 1/3 the depth of the 1.5 in.(38 mm)minimum to 4 in.(102mm)maximum below concealed space or.8 in. (203 mm), whichever is greater, bottom of insulation for noncombustible insulation-filled solid and be constructed using a material that will not allow heat or composite joist construction(Fig.3). to escape through or above the draft curtain. Minimum Distance Away From Face of Wood Truss For solid wood joist construction(Refer to Fig. 5) and ob- a I or Top Chord a Bar Joist structed wood truss construction(Refer to Fig. 7), blocking must be provide in each upper deck and ceiling joist chan- 4.5 in.(114 mm)(Refer to Fig.2) nel at a maximum 32 ft.(9.75 m)intervals.This blocking shall Remote Area: be installed to the full depth of the joist and be installed so as 1,000 ft2(92.90 m2) to not allow heat to escape through or above the blocking. (Note: Additional sprinklers that are required for protec- The blocking must be constructed using a noncombustible tion of CPVC piping that is offset over an obstruc- material. Draft curtains must be protrude below the joist a tion do not need to be included in the remote area.) minimum of 6 in. (152 mm) or 1/3 the space,whichever is Required Density: greatest and run parallel with the joist spaced at 31 ft.(9.45 0.10 gpm/ft2(4.08 Lpm/m2) m)width maximum to limit the area to a maximum of 1,000 ft2(93 m2).The draft curtain may be constructed of 1/4 in.(6.4 Minimum Operating Pressure: m)plywood to prevent heat from escaping beyond the area. 7 psi (0.48 bar) For noncombustible insulation-filled, solid wood joist or Obstruction Rules: composite wood joist construction (Refer to Fig. 6), the re- All obstruction criteria per the applicable version of NFPA quirement for draft curtains or blocking does not apply. 13 apply, unless modified by this Bulletin (Refer to Fig. 7). Concealed Space Size: The KFR-CCS is classified as an Extended Coverage Up- The Model KFR-CCS sprinkler is specifically listed for use right Spray Sprinkler when installed in locations where the in horizontal combustible concealed spaces with a slope not maximum coverage area per sprinkler exceeds 225 ft2(20.9 exceeding 2 in 12 with combustible wood truss,wood joist M.The KFR-CCS is classified as a Standard Upright Spray construction,or bar joist construction having a combustible Sprinkler when installed in locations where the maximum upper surface and where the depth of the space is less than I coverage area per sprinkler is 225 ft2(20.9 m2)or less. 36 in (914 mm) from deck to deck, from deck to ceiling,or B. Steel Pil2e Systems(Refer to Figs 4.5 6 &7) with double wood joist construction with a maximum of 36 The Model KFR-CCS Sprinkler is designed to be in- in.(914 m)between the top of the bottom joist and bottom of stalled into steel pipe sprinkler systems. It is listed to the upper joist. NFPA 13 permits the use of the Model KFR- provide fire sprinkler protection of combustible con- CCS sprinkler(a) where the space is less than 12 in (305 cealed areas where the construction methods consist of; mm)from deck to deck or deck to ceiling,and/or(b)where a portion of the protected space exceeds 36 in.(914 mm). 1. Wood trusses or wood bar joists(Refer to Fig. 4) System Type: 2. Solid wood joist construction where the upper ceil- Light hazard,wet or dry pipe system. ing joists may have a maximum depth of 12 in. Minimum Installation Distance(Spacing) Between (305 mm). (Refer to Fig. 5). ( P g) 3. Noncombustible insulation-filled, solid wood or Sprinklers: 6 ft.(1.83 m) 3.