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FM Approvals 1056
- Sight Drains for Automatic Sprinkler Systems
- standard by FM Approvals, 12/01/2010
- Publisher: FM Approvals
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This standard states FM Approvals criteria for sight drains for use in automatic sprinkler systems. They are used to allow visual verification that water is flowing through a pipe. Typical installations include main drain lines and in close proximity to inspector's test devices when discharge flow is not readily visible
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