Thanks for posting this. Very Interesting, A large number of oil systems have test holes in flues already. Yes, Theres been ongoing concern re air sealing and combustion safety by HES vendors.
WX audits dont require CAZ…"
EE & RE / Continuing Ed in Building Science.... Green and healthy homes , Energy retrofits. Green Job initiatives, Adapting to unsustainable growth and degradation of our environment.
"What good is a house when you have'nt got a decent planet to put it on" --
WATER & ENERGY NEXUS
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TED Talks Simon Sinek has a simple but powerful model for inspirational leadership all starting with a golden circle and the question "Why?" His examples include Apple, Martin Luther King, and the Wright brothers ...
(Filmed at TEDxPugetSound.)