What causes black on a furnace filter?

Why is my furnace filter black after one week?

If you’ve recently changed out your air filter and noticed it was black, you’re experiencing something called “black soot deposition. Essentially, black soot deposition is just an excess build-up of soot, which is typically the result of: A gas appliance or fireplace that isn’t burning fuel properly. Scented candles.

Why is my furnace filter so dirty?

Your filter gets clogged faster when your furnace is running more often. That’s because more air is cycled through your filter when your furnace goes through more heating cycles, so more contaminants get caught on the filter’s media. The colder it gets outside, the faster your filter will get clogged with dirt.

Do certain furnace filters turn black?

The Reasons a Furnace Filter May Turn Black

After several months of use, you may notice dust and debris starting to collect on the air filter for your furnace. This is normal, but if it turns completely black, there may be a problem.

Can a black air filter make you sick?

You get air filter black mold. As soon as you notice air filter black mold, dispose of the filters! Mold can make you and your family very ill. Symptoms of sickness from mold can include a sore throat, stuffy nose, coughing, wheezing and eye irritation.

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What problems can a dirty furnace filter cause?

Furnace Issues Caused By Dirty Air Filters

  • Damage to the Heat Exchanger.
  • High Heating Bills.
  • Poor Indoor Air Quality.
  • Clogs May Cause the Furnace to Shut Down.
  • Inability to Reach a Comfortable Temperature.

Can dirty furnace filters cause carbon monoxide?

How a dirty air filter can lead to CO poisoning. Here’s the brief explanation: a clogged filter reduces air flow and causes your furnace heat exchanger to overheat and crack. Once the heat exchanger cracks, poisonous carbon monoxide can leak into your home.

What causes soot in a gas furnace?

Incomplete Combustion

As the furnace in your house burns fuel to create heat, especially natural gas, there are remnants left over after the process is completed. … One of the combustion byproducts is carbon, the primary ingredient in black soot, which is sent up the heat exchanger and out of the house.

Do candles make air filters black?

If you regularly burn candles in your home, there’s a good chance this is the main reason your air filter is black, especially if you burn scented candles. You see, scented candles incorporate a lot of unsaturated oils that don’t burn “clean”.

What does black mold look like on furnace filter?

You can typically identify black mold by its color. Many other molds are green or grey, but black mold tends to be a dark greenish black or gray color. It will appear around the home as a slimy, dark greenish-black or gray substance. Black mold grows off of moisture, releasing spores as it consumes organic substances.

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