Furnace backdraft being blown into home by forced hot air system
Help! I am completely out of solutions and need some advice. We moved into a new home in June. As soon as we turned the heat on in late October, we noticed an oil or exhaust smell entering the home when the furnace fired up and the blowers blew warm air into the home. Since then, we have had our furnace company out twice to inspect the furnace, and have also had our chimney inspected twice. Everyone has told us that nothing is wrong, and no one has offered a solution. The smell happens on and off, and has sometimes gone a full week without happening. So far, the carbon monoxide detectors in the house have not sounded, but the electronic unit in the basement indicates that the level is close to a low alarm level at 35. We had this unit in our second floor bedroom for a week or so, and the level read 12. Can anyone offer any suggestions? I've run out of ideas.