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Modern Power Vac’s Guide to Replacing Furnace Filters

Updated: May 6

To keep your furnace working efficiently and help prevent malfunctions, your furnace filters need to be replaced or cleaned on a regular basis.

A clogged filter can create a domino effect of costly issues in your home. It reduces airflow, limits air filtration and overworks your furnace. Here’s what else you need to know about furnace filters.


How Does A Furnace Filter Work?

A forced-air furnace uses a fan to draw the air from your home through a return duct system to be warmed over a heat exchanger. The furnace filter protects the furnace by catching dust, hair and other particles in the air before they reach the fan and heating system. The filter also improves air quality by removing contaminants before the air is recirculated through your home.


Are There Different Types Of Furnace Filters?

Furnace filters come in many sizes, so refer to your furnace manual before purchasing a new filter. Disposable fibreglass filters are the least expensive option but they’re also flimsy and only protect against large particles. The most common type, disposable pleated filters, are sturdier and capable of trapping small particles like spores and mites. Reusable filters are more expensive but also more durable and efficient than disposable filters.


How Often Should It Be Replaced?

The rule of thumb is to replace your furnace filter every 90 days, although you should check for blockages monthly. Low-quality fibreglass filters should be replaced every 30 days. A reusable filter will last about five years if it’s properly cleaned every three months.

Several factors can affect the lifespan of your furnace filters, including the size of your home and how often you use your furnace. You’ll need to change your filter more often if you have pets, if you’ve been renovating your home or if someone in your household smokes indoors.


How Do I Replace My Furnace Filter?

Turn off your furnace before you replace the filter. Open the filter compartment door and slide out the old filter. It will be very dusty, so have a garbage bag on-hand to avoid making a mess. If there’s an accumulation of dust or hair, vacuum around the filter opening first.

An arrow on the new filter indicates the direction of airflow. Make sure the arrow is facing toward the furnace and away from the return duct. If you’re taking out a permanent filter to clean it, let the filter dry completely before putting it back in the furnace. Don’t forget to turn the furnace back on when you’re done.


Schedule HVAC Services with Modern Air & Water in Edmonton

At Modern Air & Water, we sell a variety of furnace filters and offer furnace maintenance, repair, and cleaning services in and around the Edmonton region. To schedule an appointment, just contact us today!


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