How to Replace your Furnace Filter

To make sure your furnace is efficiently working and you have high indoor air quality, you will need to change your furnace filter on regular basis.

As mentioned in the previous article “Filters: Finding the Right Fit for your Furnace,” the furnace filter is generally located inside the blower compartment. It varies with the furnace’s installation and may be installed as an air clean box, or a slot cut in the return air duct. Your furnace may also have a filter in the central return grill. DO NOT install in both places.

To replace your filter, you must first turn the power off at the main circuit breaker.

For Up flow furnaces:

  • Your filter is located in the blower compartment (bottom door) next to the cold air return. Remove both the top door and the bottom door. When you re-install the bottom door, it goes over the furnace frame to engage the safety switch.

For Down flow furnaces:

  • Your filter is located in the upper blower compartment. Most of the furnaces will have a V shape filter system and will take 2 filters. The filters will go into the plenum in a V shape. Again, when you re-install the top door, it goes over the furnace frame to engage the safety switch.

For Horizontal furnace:

  • The furnace will have a slide in furnace rack where your filter will be. It is built into the furnace.

For Air Handlers:

  • Most Air Handlers will have a built in filter rack in the unit, similar to the Horizontal furnace. Also note that they may have a central return, which will have a built in filter grill to accommodate a filter. Make sure you do not have a filter in the filter grill. This will cause you to have reduced air flow and a higher utility bill.

To change your common filters, you just need to slide the old filter out and slide in the new one. Make sure that the air flow arrow on the filter points toward the furnace or blower motor. $0.99 filters do not work effectively. We recommend replacing your filters with Allergy Zone and Purolator Pleated. They are economical and provide great filtration for your home. To find these filters go to: http://www.filtersusa.com/results.cfm?brandid=38&Refsrc=blog and http://www.filtersusa.com/results.cfm?categoryid=14&brandid=25&Refsrc=blog.

To change your HEPA filter, you need to open the ront of the media housing and slide the old filter out and slide the new filter in. Some models require pleat spacers. You may need to order them if yours are damaged. We recommend either OEM (Manufacture replacements) or generic replacements such as Aprilaire/Spacegard, Trion, to the generic Fiberbond or Bryant EZ Flex. You can purchase these filters at: http://www.filtersusa.com/results.cfm?brandid=5&categoryid=13&refsrc=blog and http://www.filtersusa.com/ezflex.cfm?refsrc=blog.

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