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Condensing Boilers and Room Air

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BigEHead
BigEHead Member Posts: 28
in Gas Heating
I'm looking to replace my cast iron Weil Mclain with a high efficiency condensing boiler once it dies but I don't want to create holes in the exterior walls both for HOA reasons and aesthetic reasons (wife will kill me). My current utility room has a metal duct intake (not sure what the actual name of it is) from the window which provides fresh air intake. The room is sealed when the door is closed. I've seen some condensing boilers state that they allow room air for commercial applications but I haven't seen ones that say it's ok with residential applications. Because of the intake duct, I'm not using typical "room air" so I should be ok right? I also want to use flex polypropylene in my existing chimney for the exhaust (like centroherm/duraflex). Has anyone done something like this or see something like this? Thanks!

Here is my intake duct:

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