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www.reference.com/article/furnace-filter-7cb3c59a270850f5

Furnace filters are devices that protect the mechanical system of a furnace from particulate materials. While a fiberglass fiber filter provides enough protection for most furnaces, higher quality filters also help clean the air to protect the health of the home occupants.

www.reference.com/article/furnace-filter-options-f66d036dee2b446f

The best furnace filter options are the disposable pleated and disposable electrostatic filters, according to Bob Vila. The Family Handyman also lists disposable pleated filters with a MERV rating of 7 or 8 as a good compromise between efficiency and cost.

www.reference.com/world-view/way-furnace-filters-d3033506062a2c89

Furnace filters have an arrow that point to installation towards the evaporator coil, fan and blower motor located inside the air handler. If there are no arrows on the filter, install the filter with the sturdiest side as the back.

www.reference.com/article/can-buy-furnace-filter-1fb3e5a41fb0d392

Hardware stores, such as Ace Hardware and The Home Depot, and general retailers, such as Amazon.com, carry furnace filters. Furnace filters should match the airflow recommendation from the manufacturer to ensure a long lifespan for the furnace motor and to be energy efficient.

www.reference.com/article/replacement-air-filters-home-furnaces-b3802478737addc1

A number of companies, including Filtrete, Honeywell, TrueBlue and Rheem, manufacturer furnace air filters. These filters comes in different sizes, so check that a new filter is compatible with the furnace before making a purchase.

www.reference.com/article/should-furnace-air-filters-replaced-7faf9962dc623688

Standard fiberglass furnace filters should be changed once a month, and 3-inch high-efficiency furnace filters should be changed every three months. Washable furnace filters should be cleaned once a month.

www.reference.com/article/type-furnace-filters-should-use-f71e85b2ac7cee39

Any type of furnace filter can be used, but the most popular furnace filter option is the disposable pleated type that blocks some particles and remains inexpensive. Other furnace filter options include disposable fiberglass, disposable electrostatic, permanent electrostatic and high-efficiency plea

www.reference.com/article/sells-furnace-filters-b02572f07d377f36

Furnace filters are available in a variety of stores, including hardware, home improvement, department and even drug stores. Individual manufacturers sell replacement filters for their own furnaces, and retailers list filters with online platforms such as Amazon.com and eBay.

www.reference.com/article/can-purchase-furnace-filters-e9a68d94d8143b0b

As of March 2015, furnace filters are available in stores such as Walmart, Ace Hardware and Home Depot. These stores also sell filters online. Furnace filters are also available through websites such as Amazon.com.

www.reference.com/article/proper-way-insert-furnace-air-filter-dbc800932785c163

Both the pre-cut framed filters and the cut-to-fit filters must be installed with the correct side facing the airflow. The owner's manual can be used to determine the type of filter needed and its location, or the furnace may open up so the cold air return duct can be located.