does it matter which way your furnace filter goes in
Furnace filter thats installed in the wrong direction will cause inefficiency. Which Way Does the Filter Go.
If you cant find an arrow which indicates the proper air flow there are a few additional things you can look for andor your filter will have no impact regardless of the direction.

. In general if your filter is on the ceiling the arrow should face the ceiling and if its on the wall the arrow should point to the wall. For horizontal units you will likely find the filter on the side of it. This means your furnace has to work harder to generate the same air flow resulting in increased energy costs.
Installing a Furnace Filter Properly. For vertical downflow units air comes in from the top you can expect to find the filters in the top door. Luckily most air filters are designed so that they will not fit properly unless they are inserted correctly.
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Ever wonder which way the arrow should point on your furnace air filterFind out right here. If not feel uncomfortable checking with your hand hang. This will make it more difficult for your air handler to keep air flowing through the filter which will force your furnace to work harder and.
Switch on the blower by selecting the fan options of the thermostat and make it On after removal of the air filter. However both your furnace and AC share a single filter. After a couple of seconds the blower will start running.
Look for the airflow arrows printed on the side of the air filter that indicate which direction the filter should be inserted. Remember any heating or cooling system that uses a fan to distr. For vertical upflow units where the air comes in from the bottom look for the filter location in the bottom door.
Particles are also allowed to build up irregularly making the furnace working even harder to draw air. Therefore follow these steps to properly install a furnace filter. This will allow the filter to clean harmful particles before reaching your HVAC unit.
If an air filter is installed in the wrong direction air will have to pass through the filter via the less porous side. Place your hand carefully and you can feel the flow of the air. For the most part pleated furnace filters are more efficient and last longer than simple fiberglass non-pleated filters.
That way the next time you replace your furnace filter you can just point the arrow on the filter in the same direction. We also recommend writing the date of installation on your new filter so you can keep track of when you changed it. If the air is flowing to the right the air should point to the right.
Shown in the image below. The arrows on your furnace filter should always point in the same direction as the airflow. Remove Old Filter Determine Air Flow Direction Determine the type of furnace you have before you think of replacing it with a new one.
Its a good idea to mark the direction of the airflow on your ducts with a sharpie. Look for the arrow points on the air filter. When a furnace filter is placed backwards the fibers cant do their job properly.
By installing your filter backwards air will have a harder time flowing through the filter and your air handler will have to work harder to. Most furnace filters are bi-directional does not matter which way the air travels. The arrow on your filter should always face the unit and away from the return air duct that carries the air that will.
Pleated filters contain much more surface. A furnace or central air unit that has to pull in air through the non-porous side of a filter loses efficiency because it runs longer. To make things easier just make sure the arrows on the air filter point in the same direction as the arrows on the air handler.
The arrow points in the direction the air is flowing through the duct system. One side of the filter is more porous than the other. With forced-air systems air gets sucked in through the return vents from all around your house goes through the air filter and then through the HVAC system where the air is either heated or cooled depending on what you have your thermostat set to.
Placing your furnace filter in backwards could affect your furnaces health and lead to permanent damage. As a general rule of thumb a thicker furnace filter will last longer and can be more efficientYour system configuration will determine the thickness of the filter that you can use.
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