Furnace Filter Ratings Merv

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Furnace filter ratings merv.

Below is a chart from john semmelhack showing the percentage of particles removed by size range of particle and the merv rating of the filter. Use this rating system compare filters made by different manufacturers. Most airborne contaminants found in residential homes can be removed with an air filter within merv 7 and merv 13. Minimum efficiency reporting value merv is a standard that rates the overall effectiveness of air filters.

Merv ratings above 16 are typically used in specialized commercial settings where air filtration is critical such as hospitals. What merv should i use in my home furnace. Plus higher doesn t always mean better for homeowners. While merv ratings reflect a filter s ability to trap both microscopic and macroscopic particles mpr ratings only grade a filter on its capacity to remove particles from 0 3 to 1 microns.

The most recommended merv ratings for residential filters are between merv 7 and merv 13. Merv filter ratings and air quality a position paper published by ashrae looked at the claim that particle filtration has health benefits. So while higher merv ratings are more efficient the recommended merv ratings for residential filters are between merv 7 and merv 13. Merv stands for minimum efficiency reporting value.

For reference a typical dust particle is between 2 and 8 microns while pollen starts at 7 microns and can get up to 70 microns in size. For a filter to get the merv 13 rating for example it must filter out a minimum of 90 of the pm10 a minimum of 85 of the pm2 5 and a minimum of 50 of the pm1 0. According to this paper there s a well established connection between higher concentrations of particles in outdoor air and poor health outcomes so it would make sense that filtering these particles out of indoor air could lead to better health outcomes. This is an industry standard rating system.

Furnace and air filters higher than merv 13 are typically found in a hospital environment where. The range is from 1 lowest efficiency to 20 highest efficiency. In general filters with higher merv ratings are more effective and improve air quality but are also more expensive. This rating system reports how well the filter captures and holds dust.

They all basically trap the same range of particulates particulates such as dust particles mold spores dust mite debris tobacco smoke pet dander and pollen but each filter has a higher capturing capacity the. Merv ratings range from 1 to 16. Higher value merv rating equates to finer filtration meaning fewer dust particles and other airborne contaminants can pass through the filter.