Blocked Attic Furnace Flue

A blocked or damaged furnace flue prevents combustion gases from escaping outside.

Blocked attic furnace flue.

Then use fire rated caulk to seal the gap btw the sheet metal and flue and then the sheet metal to the attic floor. The chimney is now sized too large for the flue gases. This problem is caused by hot gases cooling too quickly in the flue. Exhaust flue draft pressure testing duration.

Any moist air introduced is going to cause water to condense on surfaces more so on the cold metal of the flue properly insulated flue with an efficient furnace should remain ambient temperature. If you don t have a crawl space or a basement then it can be a challenge to place a furnace on the ground floor of the structure. This can be a problem when the flue runs into your attic on its way to the roof as it can heat your. There is no insulation shield installed in the attic around the flue vent pipe.

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 culprit. While you are at it look around for all other duct chases in your attic. Typically there is a combustion issue or bad flue design. When homeowners or contractors replace 70 or 80 furnaces with 90 furnaces which no longer use the chimney the water heater is left venting into the chimney alone.

This is known as an orphaned water heater. Will a furnace with a blocked vent cause a flame rollout duration. This increases the amount of carbon monoxide present. Once inside they recirculate and then carbon monoxide becomes part of the air taken in during the combustion process.

You might not receive the same air movement benefits if the unit is in a garage either. Instead these gases are released into your home. Nail them both on the attic floor so they butt up against the flue. As the hot gasses cool the moisture in the gases condenses and start dripping back down the flue.

A furnace in the attic is a design that works for all homes. 15 degree air assuming fahrenheit is very cold and doesn t hold much moisture. Enough condensation it drips back down. Attic fan installation hot attic made cooler.

This picture shows furnace flue condensation problems. Even if you aren t having trouble with your.