these things are quite expensive and it’s really hard to justify the cost. i have known a contractor use these when they were fitting out a small office in a high rise and only had a small window of opportunity to access the site. the flexible coupling helps keep the ceiling air tight if the ceiling moves relative to the sprinkler pipe. i have many experiences with flex drops as a foreman/supervisor in the field over the years.
with some training and planning of the installation-the productivity, flexbility, and efficency of getting the job done is much better over traditional hard piped armovers and drops. if the job is roughed in with the flex assemblies installed with the sprinkler, the contractor can test the system, and finish the sprinklers later without having to drain the system of water. with flexible drop assemblies, a fitter could finish 50-100 or more flexible drop assemblies in a day, perfect center of tile, without staining tiles or finishes with cutting oils, dirty water, or dirty fingerprints from greasy gloves. drawbacks-higher materal cost, avoiding poor installation with number and radius of bends to hose, poor hydraulic flow of hoses, avoiding other trades removing or trying to move finished sprinklers later.
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