"Sticking up for Paul
"any and all adjustments to a combustion appliance should only be carried out by a trained trade person."
I don't think Paul said anything about making adjustments "do combustion safety and gas leak…"
A presentation by Greg Labbé in April 2014 on retrofitting vintage home for energy efficiency. He talked about basic building science, brick houses, movement of heat energy and moisture in and out of the house, air barrier and water barrier, house…