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316 L stainless venting

Henry Nichols
Henry Nichols Member Posts: 14
in THE MAIN WALL
I was given a piece of info today that I need to have verified. I was told that GAMA pulled its rating on 316L stainless steel as a vent for category IV appliances. I went to the Protech site and read the AL29-4C blue paper on vent materials, page 6 being the operative chart.

I did not see any info on that site pertaining to the rating on 316L but if it is true, I need to know. Does anyone have any info with regard to this?

Thanks,
Henry

Comments

  • Bob Harper
    Bob Harper Member Posts: 1,071


    The alloy of steel isn't the issue: it is the vent or lining system and its listing. Any venting for Cat. IV must be listed to UL 1738. The only liner listed to 1738 is a new liner by Protech, which is 316Ti.Ordinary liners listed to UL1777 are not tested for positive flue gas pressure.
  • Henry Nichols
    Henry Nichols Member Posts: 14
    316

    is this posted somewhere and how did you find out about this? Secondly, will 316L make the cut and this is just a clerical issue or is 316L inferior? I read teh Allegheny Ludlum blue paper and it is specific in identifying the issues associated with other alloys.

    Will this be an issue for boilers?
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