求助DIN 1298:2015-08 热力厂用连接件.金属制烟道管.管弯头& UL441
求助(1)DIN 1298:2015-08 热力厂用连接件.金属制烟道管.管弯头
Chimneys -Connecting flue pipes for heat generating systems - Metal pipes andfittings for flue gases from domestic heat generating systems for operationunder negative pressure condition
(2)UL - 441 :Standard for Gas Vent
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