Replacing the air filter is not difficult. Remember that air flows from your ducts, through the filter and into the oven. The arrow on the filter should always point towards the oven. If the filter is on the wall, the arrow should face the wall.
Doesn't the filter have an arrow? First check it again, since almost all filters have it, probably in the corner of one of the sides. However, if you don't have an arrow, you'll want the side with the wire frame to face outward. This means that the side with the wire frame will be on the outside, or the side closest to you, and the side without it will be inside, closer to the unit. Fortunately, most air filters are designed to not fit properly unless they are inserted correctly.
Look for the airflow arrows printed on the side of the air cleaner that indicate in which direction the filter should be inserted. It is shown in the image below. Air filters have arrows printed on the sides that show how they are supposed to be installed. These arrows should point in the direction in which the air flows through the system, which is away from the supply ducts and (normally) to the blower.
Be careful when removing the old air filter, as it has probably accumulated quite a lot of dust and other particles. HVAC systems expel hot or cold air and extract spent air, circulating air throughout the house. Regardless of the HVAC system you have, each unit needs a properly tuned quality filter to keep indoor air quality clean and your unit operating at peak efficiency. If the oven filter is installed upside down, the fibers will not properly filter the air, which can eventually damage the unit.
The next time you change the filter, match the directions of the arrows and the viola, you have successfully changed the air filter. Running a filterless oven will allow dirt and dust to enter the oven and ultimately cause damage by clogging up the compressor coils. An upflow oven is installed upright, higher than it is wide, and takes air through the side or bottom of the unit, heats it up in the heat exchanger, and then blows it up into your home ducts. Dirty air filters also force your HVAC system to work harder than it needs to, reducing equipment life and increasing your energy bills.
When air filters become clogged with dust, dirt, and debris, they can no longer do their job of improving the indoor air you breathe. Some downflow ovens have a V-shaped filter system and need two filters placed in the compartment at a V-shaped angle. Try not to shake or hit the old filter, as this could release the particles back into the air in your home. We'll start from scratch and explain everything, including the direction an air filter goes in each common type of HVAC system.
But in all types of furnaces, the filter is always located near the intake air blower fan and is positioned so that air flows through the filter. Think of metal as a support that is placed behind the filter media to maintain its rigidity as air passes through it.
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