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Draw the main line from the location where your plan to install your control valves, time (if automatically operated), and backflow preventer. Draw branch lines from the main line to each head. You can route a branch line to more than one head if you use a 3â4 inch (1.9 cm) pipe, but two should be the limit.
Do exposed areas above existing sprinkler heads (former ceiling plenum) need sprinkler protection? NFPA 13:8.6.4.1.1.3 allows a maximum of 36 inches between sprinkler deflector and ceiling. With the finish ceiling uninstalled, if the deflector to underside of deck height exceeds 36 inches, then sprinklers must be provided at underside