Originally Posted By: m bettencourt
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Two water heaters mounted side by side in attic. 3" flues from each heater connect with one roof penetration. I wasn’t there, but should the minimum flue be 5" where they are joined? (100% plus 50%)
Also, I was skimming through "Mastering the Profession 4th edition" and on page 276, ninth paragraph under natural gas-venting, it says that "Two 90 degree elbows are permitted in a vent system......" I thought that G2427.6.4 "Offsets" states that you can't exceed 60 degrees. What is the discrepancy? Thanks.