1 Inch Air Filters & Furnace Filters

Replacing your 1 inch air filter is an important piece of maintenance for keeping your furnace or air conditioner system running efficiently. All Filters offers a full line of standard nominal sizes as well as custom-sized filters in the MERV 8, MERV 11, and MERV 13 ratings to fit the needs of most residential HVAC, heating, and cooling systems. Our SpiroPure furnace filters utilize premium pleated media to capture airborne particles to improve the air quality in your home. Find your replacement 1 inch furnace filters today!

	MERV 8 Pleated Filters	MERV 11 Pleated Filters	MERV 13 Pleated Filters
Filter Life	3-4 months	3-4 months	3-4 months
MERV Rating	8	11	13
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High-Performance 1 Inch Furnace Filters for Every Home

Choosing the right 1 inch furnace filters for your system can be a daunting task. Our 1 inch air filters are not only used for furnace filters despite the common term, but are also a great choice for air conditioners and combination HVAC systems. Made in the USA, our filters provide high quality pleated media to capture airborne particulate matter before it enters your system.

Just be sure to select the correct size for your heating and cooling systems. A filter that is too small allows gaps for contaminants to enter into your system and home. You can find the correct size for you by checking your system manual, viewing the sizing on your old filter, measuring your old filter, or measuring your cabinet space. SpiroPure makes it easy to find the right size for your filtration system by offering both standard sizes and custom sizes of filters so you can ensure the perfect fit.

Nominal vs. Actual Size: Getting the Perfect Fit

What do we mean by both nominal standard sizes and custom sizes are available? Nominal sizes are filters that are labeled by cabinet size rather than actual filter size. The actual 1 inch air filter will be smaller than the listed nominal size. For example, a 20x20x1 filter is most likely an actual size of 19.5x19.5x0.75. Custom size filters are cut to order to the requested actual size. However, even a custom size 1 in filter is actually cut to 0.75”, which is the industry standard thickness for 1 in air filter replacements. The easiest way to find our the size of furnace filter you require is to check the printed dimensions on your current air filter.

When to Replace Your 1 Inch Air Filter?

In addition to running effectively, your system may last longer with less failures with regular changing of furnace filters. A dirty air filter hinders air flow, causing strain. Our air filters are not only premium quality, but are also available in bulk packs with regular email reminders, ensuring you are ready to go when it is time for replacement.

In general, 1 inch furnace filter replacement is every 30-90 days, but this number can increase depending on lifestyle factors like pets, allergies, smoking, and more. Houses with pets, for example, may need to replace filters more often to maintain air flow A MERV 13 filter will also need more frequent replacement than a MERV 8 rated filter.

FAQs on 1 Inch Air Filter

How often should you change a 1-inch furnace filter?

A 1 inch furnace filter should be replaced about every 3 months, but this number can vary depending upon personal factors like pets, allergies, asthma, smoking, cooking, and more. A filter with a higher MERV rating will also experience faster loading than a lower rating.

Are 1 inch air filters and 1 inch furnace filters the same thing?

Yes. While commonly referred to as a furnace filter, 1 inch air filters can be used in furnace, air conditioning, and combination HVAC systems. The terms are used interchangeably across the industry, but they are referring to the same products.

What is the best MERV rating for a 1 inch filter?

This depends on your system’s capabilities and the degree of filtration you desire. MERV 8 is a great choice for standard residential 1 inch furnace filters. MERV 11 adds filtration for homes with pets or allergies. MERV 13 adds a higher degree of filtration, but ensure your system can handle the reduced air flow.

Do 1 inch filters protect against mold and viruses?

Depending on MERV rating, 1 inch filters offer filtration of mold spores and even some filtration of viruses. MERV 8 filters capture 70% of 3-10 micron particles, which includes mold spores, MERV 11 captures up to 85%, and MERV 13 90% with reduction of 0.3–1.0 microns at 50%, allowing for some reduction of viruses and bacteria.

Can I buy 1 inch furnace filters in bulk?

Yes! All of our filters are available in packs of 6, with some of our common standard nominal 1 inch air filters being offered in bulk packs of 12. This adds extra savings and convenience, ensuring you have a replacement on hand and ready to go for most of the season.

MERV stands for Minimum Efficiency Reporting Values and is an industry-created standard that evaluates the efficiency of air filters. The MERV rating of any particular air filter ranges on a scale of 1 to 16, with a filter rating 1 being the least efficient and a filter rating 16 being the most efficient.
While it is important for the quality of the air in your environment to choose the most efficient filter possible, it is not always as simple as buying a filter with the highest MERV rating. Because the pores allowing for air flow in a highly-rated MERV filter are very small, the filter creates more resistance against air flow and may put too much pressure on the fan of your furnace, air conditioning, or air cleaner unit. It’s important to choose an air filter with the highest MERV rating that your particular unit will allow for maximum air flow. Information about specific MERV ratings and recommendations will generally be included with the documentation that came with your system.
We recommend choosing an air filter with a MERV rating between 8 and 11 for most residential units in order to adequately remove airborne contaminants. If your system can handle a filter with a higher MERV rating, you may wish to use a filter with a rating of 13 for even greater contaminant removal. However, it’s important to remember that filters with a higher MERV rating must be replaced at least every three months to avoid restricted air flow and negative effects on your system’s performance.

Hours of Operation
Monday - Friday	9:00 am - 6:00 pm EST
Saturday & Sunday	9:00 am - 6:00 pm EST

1 Inch Air Filters & Furnace Filters

MERV 8 Pleated Filters

MERV 11 Pleated Filters

MERV 13 Pleated Filters

Filter Life

3-4 months

3-4 months

3-4 months

MERV Rating

8

11

13

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