I have a new customer that has 3 of these boilers that has to at least 2 times a year change rollout Switches. His chimney is 10 inches which I suspected was the Problem, but upon further inspection I found this. See pic. Has anyone ever seen anything like this before? All 3 boilers have it. Just a plate covering 3/4 of flue right before vent damper. Boilers are 50,000 btu. Nothing in manuals I have found have any mention of this plate which seems to be part of boiler. Thanks in advance.
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