![]() ![]() A sensor in the furnace gets overheated, and a switch shuts down the furnace to prevent major damage. The reduced airflow caused by the backwards filter isn’t letting out the heat. Is your furnace acting funky after filter change? Specifically, does it turn off before the temperature you set the thermostat to is reached? You want it 74, but it keeps shutting down and the house is 72? This is called short cycling. The most common problem if the filter is backwards is reduced airflow, which can lead to poor efficiency and higher energy costs or equipment that works harder than it should and breaks. Maybe nothing bad – or maybe something expensive! What Happens If You Put a Furnace Filter In Backwards? If air filter direction is still unclear, read on.We’ll “start from scratch,” and explain everything including which direction an air filter goes in each common type of heating and air conditioning system. Within a few seconds of the blower starting, you should be able to feel which direction the air is going by putting your hand, a few fingers or even a slip of paper (hang onto it tightly) into the place the filter goes.Then, with the filter removed, not in the furnace, turn on the blower by choosing the Fan option of the thermostat and setting it to the On position.Turn the filter around until you find the arrow.In a downflow furnace – yes, the arrow should point down.Įvery furnace filter frame has a printed direction arrow on the side of it. In an upflow furnace, the arrow should point up. ![]() For example, if air is flowing from the left to right, then the arrow points right. It’s one thing to say the arrow should “go with the flow,” by pointing in the direction that air is moving. Quick Way to Find Air Flow Direction in a Furnace or Air Handler The furnace filter, aka air filter, should be placed so that the arrow points in the direction air is flowing within the air handler, furnace and/or ductwork. How to Properly Dispose of a Used Filter.Locating the Filter and Filter Direction Tips.What Happens If You Put a Furnace Filter In Backwards?.Quick Way to Find Air Flow Direction in a Furnace or Air Handler.Which Way Does the Furnace Filter Go In?.To find out what size filter your furnace uses, remove and check the old filter (the size should be written on the frame of the filter) or refer to your furnace manual. Height and length combinations range from 10”x10” all the way to 30”x30”. The most common thickness is 1”, with 4” also being a popular choice on larger systems. Filter sizesįurnace filters are sized by thickness (depth), height and length. Check your furnace manual to ensure you can safely use electrostatic filters. This process helps trap small particles, making them good for homes with pets or people who smoke inside. Electrostatic filters self-charge themselves as air passes through them. A note about electrostatic filtersīoth disposable and washable filters come in electrostatic versions. They come in a range of sizes and ratings, and while more costly to purchase, they last an average of 5 years if maintained with a proper cleaning at least every 90 days. These filters can be vacuumed off and cleaned with water. Permanent reusable filters (also referred to as washable filters) are constructed with either a solid aluminum or plastic frame and are more efficient than a disposable filter. Due to their inferior quality, disposable fibreglass filters should be checked and replaced more frequently than pleated filters.įROM HGTV CANADA: Firerating & Fireproofing Your Furnace They come in many standard sizes, but are generally more flimsy and have lower ratings than pleated filters. They have an almost spider web appearance and are most often blue in colour. (If you have whole home air conditioning the process is similar with the air being cooled in the summer by an outdoor compressor unit and a series of coils inside your furnace).ĭisposable fibreglass filters are the cheapest filter on the market. The furnace runs until the temperature inside reaches your desired thermostat setting. How a furnace worksĪ traditional forced-air furnace draws air in via return ducts, warms it over a heat exchanger then, with the help of a blower fan, pushes the heated air through a series of ducts that branch off into rooms throughout your home. Sounds simple, but in reality there are so many options for furnace filters that choosing the wrong one can do more damage to your furnace than good and could potentially cause your furnace to break down. But in order to keep it working to its optimal performance - and help prevent a possible malfunction - you need to either change or clean your furnace filter on a regular basis. TORONTO – If you’re like most people, you probably don’t give your furnace much thought as long as it’s keeping you warm in the winter and cool in the summer. ![]()
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