Strong sewage smells are a telltale sign that your toilet vent pipe may be clogged.
Gas furnace vent pipe blocked.
Now let s look at the top signs to look for which may mean a vent is clogged.
The pressure switch can also be tripped by an obstructed exhaust flue gas vent pipe.
Gas and oil furnace have a vent pipe or flue that sends the gaseous by products of combustion to the outdoors.
If you see rust or water streaking on the vent flue or on your chimney something may be blocking the flue.
Similar to an obstructed air intake pipe check for obstructions such as nests or leaves but also check for inadequate sloping of the vent pipe and make sure the exhaust pipe is supported every 5 feet of its horizontal run.
If your furnace is having problems with starting or seems to be trying to start but doesn t blocked airflow from the intake pipe is a common.
Failure to ignite caused by clogged flue vent.
How to clean and clear furnace exhaust vents.
Moisture builds inside your furnace pipes when the air can t properly circulate and this can result in rust.
Gas furnaces build up scale which forms when gas byproducts and moisture combine and these can block the flue.
To work properly a furnace needs adequate airflow.