Furnace HVAC Filter Guide: How to Measure Air Filters and Understanding MERV Rating

The Honeywell Store offers a robust range of Honeywell Furnace Filters for HVAC Systems. Capable of improving the quality of air you breathe by capturing dust, allergens and more potentially hazardous contaminants, Honeywell Furnace HVAC Filters are available in a variety of sizes (1 in. filters are also now available!) and MERV types. A large selection of sizes ensures a wide compatibility range when selecting the appropriate air filter for your furnace. If you're new to purchasing an HVAC filter, you'll want to get the sizing just right to ensure the best performance possible. Here's an easy step by step guide for doing just that:

Measuring Furnace Filters for HVAC Systems

  • Step 1: You'll want to turn off your HVAC unit before removing the air filter.

  • Step 2: Locate your home's HVAC system and remove the air filter.

  • Step 3: The measurements of the filter should be printed on its side. If they're not, don't worry! Simply grab a tape measure and do the following:

    • You'll want to measure the filter's length and width. This will provide you with the filter's (L x W).

    • You'll then want to measure the filter's thickness (or depth) from front to back (D). This will always be your smallest number.

Now gather all of the numbers together. The result should look like this (L x W x D). Congratulations! These are the measurements of your home's HVAC Filter. Home HVAC Systems often vary in size. When you combine this with the large amount of Honeywell HVAC Filters readily available for online purchase at the Honeywell Store, it's essential that you gather the correct measurements! Now that we've covered sizing, let's take a look at MERV Rating.

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Understanding an Air Filter's MERV Rating

MERV or 'Minimum Efficiency Reporting Value' is used to rate the overall effectiveness of an air filter. Below you will find a table that measures the MERV strength and tells you the application of each HVAC filter's effectiveness. In general, an air filter with a higher MERV Rating is more effective and has a broader application, but most residential homes will find the best use from an air filter that's between the 5-13 MERV rating.

MERV RATING MIN. PARTICLE SIZE TYPICAL CONTROLLED CONTAMINANT TYPICAL APPLICATIONS
1 - 4 > 10.0 Micrometers Pollen, dust mites, cockroach debris, sanding dust, spray paint dust, textile fibers, carpet fibers Residential window AC units
5 - 8 10.0 - 3.0 Micrometers Mold, spores, dust mite debris, cat and dog dander, hair spray, fabric protector, dusting aids, pudding mix Better residential, general commercial, industrial workspaces
9 - 12 3.0 - 1.0 Micrometers Legionella, Humidifier dust, Lead dust, Milled flour, Auto emission particulates, Nebulizer droplets Superior residential, better commercial, hospital laboratories
13 - 16 1.0 - 0.3 Micrometers Bacteria, droplet nuclei (sneeze), cooking oil, most smoke and insecticide dust, most face powder, most paint pigments

Ultra residential, best commercial, hospital & general surgery
Honeywell Standard, High & Ultra 1 In. Air Filters

The Honeywell Store now features Honeywell One Inch Air Filters. Available in packs of four, 1 inch filters last up to three months, ensuring each purchase lasts up to one year. All 1 inch furnace filters implement easy flow energy efficiency and are encased in a heavy duty frame, ensuring lasting durability. The availability of different sizes and MERV Ratings will allow you to choose the best one inch air filter for your specific needs. Let's take a closer look at the Honeywell Store's selection of 1 in. furnace filters and how they differ from one another.

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Browse the latest Honeywell Store news, product updates, buying guides, safety tips, promotions, and store announcements.

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Honeywell Air Coolers: Strong, Maneuverable Cooling for the Summer

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What Will Happen if I Don't Clean my Humidifier?

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Honeywell Store Back to College Sale - 20% Off With Coupon Code: DORMLIFE - Ends September 3rd, 2018

Take 20% off select honeywell air purifiers, humidifiers, safes, fans and heaters and Humidifiers won't improve the ol' GPA, but they will allow immediate access to cleaner and healthier breathing air. Stay cool and don't sweat the small stuff with the addition of a Honeywell Fan. Winter is coming. Be ahead of the curve with a Honeywell Heater. Have a roommate? Want to protect something that's not meant to be read or touched? A Honeywell Safe is exactly what you need to instill some much needed peace of mind in the dorm room.

For a Limited Time Only, FREE SHIPPING on ALL Honeywell Safes

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Honeywell Work Safety Products - Industrial Occupation or DIY Home Protection

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Honeywell Air Purifiers for the Spring Allergy Season - Allergen Remover | True HEPA Filters

The list of spring allergies influencing millions of Americans is numerous and includes the likes of pollen, dust mites, mold and pet dander. Pollen is the primary offender as an elevation in temperature allows it to move freely at a much more rapid pace. The Honeywell Store presents an affordable and portable solution that's defined by its overall capacity for alleviating a surrounding area from the many discomforts associated with springtime allergies.

Learn the Benefits of Replacing Your HVAC Furnace and What MERV Rating Means

It is recommended that HVAC Furnace Filters be replaced every month. This is especially important in the summer and winter months when HVAC Furnaces are tasked with an additional workload. By replacing HVAC Furnace Filters in a routine fashion, homeowners will have access to an increased amount of benefits. One such benefit is the extended lifespan of an HVAC unit.

The Largest Capacity Portable Air Cooler Yet!

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