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…"
WX Auditor - BPI BA, Envelope, Multi Fam & Heating Specialist
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Combustion Appliance Zone Testing (CAZ) Made Easy (March 24, 2016)
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