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Why is my furnace filter black?

Posted on March 3, 2015
by Appleby Systems

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why is my furnace filter black?

A black furnace filter is a sure sign something is seriously wrong with the internal workings of your furnace. Maybe you’ve just skipped out on replacing the filter for an overly long time, but if you replaced it within the last year, it might be a sign of something like:

  • Inadequate combustion air
  • Carbon monoxide
  • Mold

Inadequate air supply or carbon monoxide can both cause soot to form on the furnace filter. Mold in your home can lead to all sorts of respiratory problems, especially for young children and homeowners over 65 years of age. Carbon monoxide can be flat-out deadly.

Some modern homes are too airtight, resulting in poor combustion air; carbon monoxide can come from a faulty furnace or an adjacent garage. Fortunately for you, Appleby Systems can send a technician to your home 24/7 to diagnose and repair any problem you’ve discovered with your heating and cooling systems.


Furnace Maintenance, Air Filter Replacement

The air filter in your furnace should be replaced or cleaned every three months if it’s an electronic air cleaner or 1” throwaway filter, or replaced once every year if it’s a media filter. As dust and debris accumulates on the filter, your furnace has to work harder and harder to draw air past the obstructed surface. You can combine an air filter cleaning or replacement service with other seasonal maintenance tasks to keep your furnace in tip-top shape. Have a look at our seasonal maintenance guides to see what goes on with an inspection of your:

Avoid Carbon Monoxide Leaks and Fire Hazard

why is my furnace filter black?When you get your furnace serviced regularly, you can avoid the risk of carbon monoxide leaks. A standard service visit will check for anything that could lead to a leak. If you join our maintenance list, we will send you an automatic reminder when an essential maintenance task should be booked.

Of course it’s your choice to book the service, but we highly recommend keeping with a regular service schedule. You do it for your car; you should do it for your furnace.

Contact us today if you’ve noticed a thick buildup on your furnace air filter or to book your regular seasonal maintenance.

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