I installed 6 B&J big mouths on a recent job. At the time of installation, all seemed to be well on the test fire. However, only 2 weeks later I was called back due to the boiler losing vast quantities of water as well as the homeowner noticing odd sounds. Upon arriving, steam was observed exiting a doorjam above the vents!
(Damage to the finish of the door due to the steam)
In total, 3 of the installed 6 vents were still steaming after steam reached them, one severely. https://i.imgur.com/C0tamj0.mp4
Has anyone else seen this with recent batches of the big mouths, or is this a fluke? Also, how should I go about getting replacements? Currently they've been replaced by the $1 main vent (3/4" pipe plug), but I'd obviously like to install new ones ASAP. Thank you all, and a belated Merry Christmas!