We can breathe; they rigged-up a vent from the water heater and it vents through the unlined opening. As an added precaution, I'll leave the window near the water heater open. The boiler, on the other hand, is not vented at all, so it is off. It's going to get chilly in the house if the weatherweenies are right about the temps dropping into the mid-30's. Think I'll go get some firewood in before it rains anymore!
mine?