We've got a boiler in a closet in a garage with some bypass closet doors on it. It had combustion air in there until those vents were blocked off with cardboard. Likely someone realized running the zone plumbing directly in front of the air vents was a less than ideal install and fixed that with their Amazon box. Could the combustion air vents be relocated to the other side of the garage or is there a distance limitation between the boiler and the vents? How could we separate the heat and the vents a little better here? Thanks. Brendan.