Download Attachment: IMG_5520.JPG 113.3 KB You can barely see it in this shot (taken 2 days ago).. Oil-fired 'conversion' boiler (formerly coal) (at L) behind water heater. Vent goes into chimney. Barometric damper is 'in' the chimney at the circle... we see this a lot, but less and less as these old monsters get swapped-out.. "Strange, but true"