Valve trains over 400,000 btu

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David T

Member
Sep 22, 2012
26
I believe underwriters labortories requires special valve train designs that includes special safety devices when a gas appliance is over 400,000 btus. Would Ul's requirement superceed state gas codes and is 400,000 btus be the standard for what would be concidered "Large Appliances"

Thank you
 
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