02-02-2011, 07:36 PM
Ran a call this early am and found the intake and inducer full of ice...improper intake piping with a booster fan inline to compensate for inadequate size of pipe ...intake defrosted and but not corrected yet and unit running, but I noticed that the exhaust flue was leaking around the 3" insulation. I peeled it away and found steel double wall piping into an insulated square duct which is the common vent with a cat I hot water heater with a draft booster tapped into it. This all terminates into a masonry chimney. I would expect this boiler to be vented on its own with stainless steel vent piping. What type of vent pipe should be used for this condensing boiler?