There are three basic types of furnaces, and the filter is located in different places depending on the furnace. But in all types of furnaces , the filter is always located near the intake air blower fan and positioned so that the air flows through the filter. An upflow furnace is installed in an upright position, taller than it is wide, and takes in air through the side or bottom of the unit, warms it in the heat exchanger, and then blows it upward into the ductwork of your home.
Furnaces in the basement are upflow furnaces. With an upflow furnace, the filter will be located near the bottom of the unit in the blower compartment next to the cold air return.
Which side goes up? The arrow should be pointing up. A downflow furnace takes the air in at the top, warms it, and then blows it into your ductwork.
The intake air is moving downward so the filter will be located at the top, in the upper blower compartment. Most attic furnaces are downflow furnaces. If it is in the attic or upstairs of your house and taller than it is wide, it is a downflow furnace. The arrow should be pointing down. Some downflow furnaces have a V-shaped filter system and need two filters placed in the compartment in a V-shaped angle.
A horizontal furnace draws air in on one side, warms it or removes heat from it to cool it, and blows the treated air into the ductwork on the opposite side. Most horizontal furnaces will have a slide-in filter inside the unit. It will be located on the side that draws in the cold air.
The filter will generally slide into a rack or slot. Still confused? A simpler way to figure this out is to always make the arrows face the ceiling or wall. If your filter is on the wall, the arrow should face the wall. If your filter is on the ceiling, the arrow should face the ceiling. Still not finding the arrow? The side with the wire frame should be facing outward and the side without it will be inside closer to the unit. Filters with higher MERV ratings are best at stopping particles from blowing out into your home.
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This article was written by Jake Gibson. Click here to connect with Jake on Linkedin. Exact filter locations vary by unit, but you can use the following as a general guide for locating your filter: For horizontal air conditioner units air flows horizontally through the unit , find the filter on the side of the unit. For vertical upflow units spent air comes in from the bottom of the unit , find the filter in the bottom door.
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