Cleaning of the chimney varies a lot from one area to another. A vent that is clogged can add between $18 and $24 per month to your electric bill. Although there are commercial products available today, nothing beats the good old rags. Next take the locking collar and attach it to the whole which has just been opened. If you got kids, this can be very harmful to their health. When there is dust build up in the system, it will not work properly.