Best answer: How do you read an air filter size?

What do the numbers on an air filter mean?

Filter efficiency and performance is often indicated by the filters’ minimum efficiency reporting value, or MERV rating. Standard MERV values range from 1 to 16, with the number serving as an indicator of how well the filter will remove material from the air. Higher MERV numbers indicate better filtration.

Is MERV 13 too high?

Filters within a MERV rating of 17-20 are almost never necessary in a residential home. A MERV rating of 13-16 is considered hospital level air quality, so it is unlikely your home needs any more than that.

How do I know my MERV rating?

MERV ratings range from 1 to 20, with lower ratings denoting a lower-quality filter.

  1. MERV 1-4 Filters: Filters with a MERV rating of 1 to 4 do little to trap harmful particles in your home’s air. …
  2. MERV 5-8 Filters: MERV ratings of 5 to 8 indicate a medium-quality filter that’s sufficient for most homes.

How do I know what size filter to buy for my furnace?

Almost always, furnace filter sizes are printed on the side of the filter. They are read as Length x Width x Depth. When inspecting furnace filters, homeowners may find two different sets of sizes. First, there is the nominal size expressed in whole numbers.

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What is the standard AC filter size?

Standard air filter sizes include:

10X20 14 X 20 20X20
12X12 14X24 24 X 24
12X20 14X25 20X24
12X24 14X30 20X25
12X30 15X20 20X30

What is the difference between MERV 8 and MERV 13?

A filter with a MERV rating of 13 catches more contaminants and could be considered “better” than a MERV 8 filter. … A MERV 8 filter is best for New Jersey homeowners who are simply trying to keep their HVAC system healthy and clean and don’t want to spend too much on a filter.

What is the MERV scale?

MERV stands for Minimum Efficiency Reporting Value. MERV ratings are on a scale of one to 20 depending on the minimum size of the particles a filter can be expected to capture: A filter with a MERV rating of one to four captures particles greater than 10 micrometers.