One of the main jobs of vent pipes is to get rid of those nasty odors and gasses so if you smell something off it s time to check it out.
Gas furnace vent pipe blocked.
Failure to ignite caused by clogged flue vent.
Over time the furnace exhaust vent can become clogged with.
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 you see rust or water streaking on the vent flue or on your chimney something may be blocking the flue.
Now let s look at the top signs to look for which may mean a vent is clogged.
Gas furnaces build up scale which forms when gas byproducts and moisture combine and these can block the flue.
Gas and oil furnace have a vent pipe or flue that sends the gaseous by products of combustion to the outdoors.
To work properly a furnace needs adequate airflow.
Moisture builds inside your furnace pipes when the air can t properly circulate and this can result in rust.
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.
Strong sewage smells are a telltale sign that your toilet vent pipe may be clogged.