Hi, the renovations to my house are nearly complete and I had a question regarding HVAC direct vent. The heating guys installed HVAC in place of our steam heat and now there are these 2 big pipes on the side of my house (by the front of the house). I assume these are the direct vent to the HVAC unit as our mechanical room is located at the front of the house). The problem is that the smoke is blowing towards my neighbor's property and they want us to move the vent. According to my contractor we are code compliant (code requires the pipe to be 6 feet inside the property line) so he doesn't think it's a problem. I've asked him to ask the HVAC people if they can move the pipes away from my neighbor's--which would mean putting the pipe at the front of our house (which I'm okay with). My question is is the smoke coming out of that pipe harmful? Should I be concerned? Any information or advice would be greatly appreciated. This is my first time with construction and I am still learning as I go.