Closed dampers or registers, not sure what you mean by vent. Chimney? Return air grille?
You can check the air filter every 3-4 weeks. A dirty filter can cause your furnace to overheat. Learn how to clean your furnace, dirt is the number one cause for furnace malfunctioning.
Noise more than anything as long as the airflow rate (cfm) is correct for the size unit you have.
It depends on the cause of the furnace fire. Remember that homeowners insurance is all tied to the cause and whether or not it is a covered cause. If the furnace fire was caused because of lack of maintenance then it would not be covered. If the furnace fire started because of some other accidental covered cause then it would be covered.
Heart attack
Yes, a blown fuse can cause your furnace to not turn on. Check the breaker box and see if any of them have tripped.
cause hes a sweaty spaker
Pizza
Water leaking from a furnace most likely occurs from the heat of the furnace which transforms into a liquid. The best way to avoid the leak is to put your furnace at a lower temperature.
yes it can fan
Cause it's cold n1gga!
Maybe. But don't tell the insurance company that a stray cat is the cause because maybe it is not the cause. Tell the insurance company that your furnace stopped working suddenly and you don't know why. Then let the insurance company investigate. Maybe you have a bigger electrical problem. Maybe you should contact an electrician to inspect your wiring.
An ordinary furnace is not an engine at all, because it does not directly cause mechanical motion. The heat or expanding gases released in a furnace can be used to drive an engine, but that is a separate component from the furnace. If a furnace is used in this manner, the engine is an external combustion engine.