ANSI Z21.18:2000 pdf download.GAS APPLIANCE PRESSURE REGULATORS. 13 ASSEMBLY 13.1 Air movement (breathing) from the atmospheric side of the regulator diaphragm shall take place only through the vent opening(s). 13.2 The construction of parts not covered by this standard shall be in accordance with reasonable concepts of safety, substantiality, durability and interchangeability. All specifications as to construction set forth herein...
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