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UL-1738-2021 pdf download – Venting Systems for Gas-Burning Appliances, Categories II, III, and IV UL Standards free download

UL-1738-2021 pdf download – Venting Systems for Gas-Burning Appliances, Categories II, III, and IV

UL-1738-2021 pdf download - Venting Systems for Gas-Burning Appliances, Categories II, III, and IV . 10 Thimbles 10.1 A venting system intended for horizontal installation shall be provided with a thimble constructed to enable the venting system...
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