flanged opening 中文意思是什麼
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Series 97fb - fsfe ( flanged ) and 97gb - fsge ( grooved ) ul / fm fire service strainers are used in conjunction with a water spray system to protect the system against clogging that can be caused by particles fouling the small discharge opening of the sprinkler heads
系列97fb - fsfe （法蘭）和97gb - fsge （溝槽） ul / fm消防應用過濾器用於與水噴淋系統一起保護系統不會由於顆粒積垢在噴淋頭排泄口而導致系統堵塞。
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