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| Duct Model Sprinkler System Applications, page 3. |
"For plastic and thermoplastic duct, Section 2.5.2 of the FMRC Data Sheet 7-78 requires:
a. Plastic duct systems not approved by FMRC, and used for handling noncombustible material, should be protected as follows:
b. Install sprinkler in all ducts having a cross-sectional areas greater than or equal to 100 sq. in. (645 sq cm) or diameters greater than or equal to 12 in. (305 mm). Sprinklers should be provided in smaller ducts which offer serious exposures.
c. Sprinklers should be spaced not more than 20 ft (6.6 m) o.c. in horizontal ducts or 12 ft (3.7)
o.c. in vertical ducts. Base the water supply on a density of at least 0.50 gpm/sq ft (20 mm/min) over the projected area of the duct, but not exceeding 100 lineal feet (30 m) of duct However a minimum flow of 20 gpm (75 cu dm/min.) per head (within the 100 ft (30 m) limit) is needed. A 250 gpm (945 cu dm/min.) hose stream demand should be included."
"When FMRC-Approved plastic ducts are used for handling combustible environments, sprinklers specified under "Protection Systems" should be provided inside the ducts."
The FMRC Data Sheet 7-78 cites several examples where the installation of sprinklers result in the curtailment of losses due to exhaust system fires. They also state examples of duct fires in non-protected duct systems that resulted in losses totaling several million dollars. Properly installed FlexHead systems simply extinguish fires, and protect exhaust systems, manufacturing, people and buildings from destruction.
FlexHead Sprinkler Systems make sense
wherever sprinklers and ductwork meet. |
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