Many people think that choosing the right air filter size is very easy. Some stores will sell you any size they have. Most of the time, this results from a lack of understanding of what size the filter needs to be.
If a sales agent claims to know how to choose the right air filter size, this does not mean it’s true for you too. There are particular things that you need to consider before choosing. Below are some tips on how to choose the right air filter size.
Measure Your Existing Air Filter
To make sure you buy the right size air filter, you’ll need to measure the one you have now. Most air filters are square or rectangular, so measuring them is pretty straightforward. Just pull your existing air filter out of the furnace and measure it in inches.
Once you have those measurements, you can shop for a replacement that’s the same size.
But, to give you an idea, the most common rectangular AC filter sizes with 1-inch thickness are:
- 10x20x1 air filter
- 16x24x1 air filter
- 16x25x1 air filter
- 18x30x1 air filter
- 20x25x1 air filter
Know Your Furnace Model Number
Like most people, you probably don’t think much about your air filter or furnace model number.
The filter you need will depend on your furnace type and model. So when something happens to your HVAC system, knowing your furnace model number can help your HVAC contractor determine what parts are needed to fix your furnace.
Also, having the right air filter can help keep your furnace running smoothly and efficiently.
Your furnace’s model number is typically on the front of the unit, just below the door. If you don’t see it there, check inside the door for a sticker or label that has the model number listed.
Once you have the model number, you can use it to look up the recommended filter size in the owner’s manual.
If you don’t have the owner’s manual, don’t worry. You can also find the recommended filter size through a quick online search. Just type in the make and model of your furnace or air conditioner, plus the words “air filter size.”
Once you know the recommended filter size, buy one that’s the same size or slightly larger.
A smaller filter will get clogged quicker and won’t do an excellent job of filtering out particles from the air. And if you use a bigger filter, it might not fit snugly in your HVAC unit, which can also reduce efficiency.
Use a Custom Air Filter
If your current air filter is an odd shape or size, don’t worry. You can still find a replacement that will fit properly. In addition, many home improvement stores sell universal air filters that they can cut to fit any furnace.
Or, you can purchase a custom air filter from an online retailer. Either way, ensure you get the right coverage for your furnace, so it runs efficiently and doesn’t overwork itself.
Final Thoughts
Choosing the appropriate air filter can be a challenge, and finding the right size air filter, is even more so.
As you can see, there are a few different ways to get the right filter for your needs. Measuring your filter will ensure that it fits securely into your air duct, so take any necessary measurements before ordering your new filter.
So never take replacing an HVAC filter for granted – it can affect your indoor air quality and your family’s health.
