Furnace air flow direction9/1/2023 The filter slot is typically vertical in orientation (but sometimes horizontal), and the filter inserts into the slot much like a chip-style credit card goes inside an ATM. It is positioned adjacent to your furnace, where the main ductwork trunk connects to it. 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. If the air is flowing to the right, the air should point to the right. The arrows on your furnace filter should always point in the same direction as the airflow. Which Way Should the Arrows Point on the Furnace Filter? You should feel the movement easily, but if not, use a thin sheet of paper– the air will push it in the direction it is flowing. Stick your hand or piece of paper into the filter opening to determine the airflow direction. To determine the airflow direction, if you don’t have an arrow indicating it, turn off your furnace (put the thermostat to “off”), turn the fan option from “auto” to “on,” then remove your filter. If you can’t find an arrow on your furnace, look harder or determine the direction with your hand or a piece of paper. So, if it is pointing to the left, that means the air is moving from the right to the left. The arrows point in the direction of the airflow. Usually, furnaces have multiple arrows stamped into the metal near the filter housing. To determine the airflow direction in your furnace, all you have to do is look for an arrow on the side of it. Which Way Does the Airflow in My Furnace? If the heat can’t escape into your home, it overheats the furnace and leads to short cycling. Info: When a backward filter blocks enough airflow, it will trap lots of heat inside the furnace. It usually doesn’t cause any lasting damage to your furnace, so you shouldn’t worry about it after correcting the filter orientation. Short cycling is a safety feature it shuts off the furnace to prevent damage from overheating. Your furnace is shutting off before reaching your thermostat’s setpoint ( short cycling).If you’re feeling chilled after replacing your furnace filter, you will notice that your furnace is running more than usual.So, how do you know if you’ve put your furnace filter in backward? It will reduce airflow, which puts strain on the HVAC equipment, dramatically reduces efficiency, and increases heating costs. If you put your HVAC filter in backward, there is a slight chance you will harm your furnace. What Happens if You Put Your Furnace Filter in Backwards? Info: All furnaces have arrows indicating the airflow direction. So, when installing your new filter, make sure the filter’s arrows are pointing in the same direction as the arrows on your gas furnace, as shown in the image above. The airflow direction of your air handler is also indicated with arrows on the outside of the filter housing. You should always install the filter with the arrows pointing in the airflow direction. If someone in your family has allergies, it may be worth investing in this filter type.All furnace filters (or HVAC air filters) have arrows around the edge that point in the airflow’s direction in your air handler. Note: Some filters-in both disposable and reusable varieties-are rated as “antimicrobial” or “high-efficiency particulate air” (HEPA) and are specially treated to trap microorganisms, including bacteria, mildew, fungus, mold, yeast, and algae. The most expensive filters are reusable electrostatic filters, which are designed to trap even smoke and smaller airborne particles. Options like the 6-stage Electrostatic Air Filters (available on Amazon) are able to be rinsed clean with a garden hose as needed and reused for several years if properly maintained. Varieties like the MERV 8 air filters by FilterBuy (available on Amazon) are a bit pricier but will last from four months to one year. These filters, like the E-Z Flow Air Filters (available on Amazon), are designed to be thrown away after one to two months.Ī step up from the basic filter is a disposable pleated paper filter, which will remove smaller particles of dust, dirt, and pollen. The fiberglass interior traps larger particles of dust and dirt. The most basic model is an inexpensive disposable fiberglass filter within a cardboard frame, typically one or two inches thick and available in a variety of sizes. There are numerous options available in furnace filtration. What type of furnace filter should you use?
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