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E <br />Enclosure I <br />decipher the date the piping was manufactured you can contact the supplier or <br />manufacturer of the piping for assistance. Also note that there are some differences in <br />labeling (i.e., changes to product type and fuel types), and this might also help to <br />determine the difference between pre- and post -July 1, 2005 piping. <br />Can piping manufacturers use listings from an independent testing organization <br />other than UL? <br />There are a number of independent testing organizations under which piping may be <br />listed, and many piping manufacturers hold listings under more than one independent <br />testing organization. Therefore, it could be possible that piping manufacturers who fail to <br />meet the revised UL 971 standard will continue to manufacture and sell their piping using <br />one of their other independent testing organization's listings. <br />While this practice is not in direct violation of statute or regulation, you may want to <br />question the manufacturer as to whether the piping is not UL listed because of testing <br />failures related to the revised UL 971 or whether the piping is still undergoing testing. <br />Piping that failed the revised UL 971 standard may have a greater probability of failure in <br />the field, and may not meet California's statutory requirement for product compatibility.' <br />If the piping is still undergoing testing, we recommend not installing the piping until it <br />receives a passing report from UL. <br />1 Health and Safety Code, Chapter 6.7, sections 25290.1(c)(1)-(2), 25290.2(c)(1)-(2), and 25291(a)(1)-(2). <br />-2- <br />