My Oil Furnace is blowing black soot into the house through all the vents. What could be causing this and what can I do to fix the problem?

Checked my gas furnace filter and found it to be totally black. This condition occurred a few months earlier this year. The filter is changed monthly,so there were two filter changes that appeared normal. Is my flue loading? The furnace is 8yrs. Old.

Soot- black substance formed by combustion or separated from fuel during combustion, rising in fine particles, and adhering to the sides of the chimney or pipe conveying the smoke. My oil furnace is running, but doesn't sound as strong or clear. The notice this problem for 2 days. The smell in the...

I sit directly under a air vent in my office building which is an older 8 story building. Every year when the air conditioner get going my desk gets sprayed with small black flakes. They are very small and hard but can be easily crushed into a power. I would guess its some type of carbon build...

My daughter moved in to a fairly new apartment with heat & air that comes from an electrical unit at the front of the apartment. The unit is similar to something you would see in a hotel room. There is black soot that is on her things. When you rub your finger through it it smears. Does anyone...