Blocked Attic Furnace Flue

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.

Blocked attic furnace flue. There is no insulation shield installed in the attic around the flue vent pipe. This picture shows furnace flue condensation problems. Typically there is a combustion issue or bad flue design. 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.

Even if you aren t having trouble with your. This problem is caused by hot gases cooling too quickly in the flue. Instead these gases are released into your home. This increases the amount of carbon monoxide present.

The chimney is now sized too large for the flue gases. Once inside they recirculate and then carbon monoxide becomes part of the air taken in during the combustion process. This will stop the air from getting a free ride along the chase and heating your attic. Attic fan installation hot attic made cooler.

This can be a problem when the flue runs into your attic on its way to the roof as it can heat your. Because the flue is carrying exhaust from natural gas or propane being burned it can get hot. While you are at it look around for all other duct chases in your attic. A blocked or damaged furnace flue prevents combustion gases from escaping outside.

Then use fire rated caulk to seal the gap btw the sheet metal and flue and then the sheet metal to the attic floor. As the hot gasses cool the moisture in the gases condenses and start dripping back down the flue. 15 degree air assuming fahrenheit is very cold and doesn t hold much moisture. Enough condensation it drips back down.

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. A furnace in the attic is a design that works for all homes. Will a furnace with a blocked vent cause a flame rollout duration. This is known as an orphaned water heater.

You might not receive the same air movement benefits if the unit is in a garage either. Nail them both on the attic floor so they butt up against the flue.