The higher the merv rating the smaller the pores are for air to flow through an hvac filter.
Merv air filter rating.
Filters with a merv 11 rating have a dust spot efficiency of 60 65 and are 30 times more.
This can create more resistance in airflow than a system is designed to manage thus making it.
An air filter s minimum efficiency reporting value merv rating measures how effectively the filter stops dust and other contaminants from passing through the filter and into the air stream.
The rating system is called ashrae standard 52 2 2007.
Filters with higher merv ratings trap small particles more effectively than filters with lower merv ratings.
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.
An air filter s merv rating is a scale from 1 16 that describes the minimum efficiency of the air filter.
Many homes use filters with a merv rating of 1 4 which mostly filter out dust lint and pollen among other larger common particles they do very little to trap small microparticles.
Ashrae developed the merv air filter efficiency rating system.
With a dust spot efficiency of 30 35 they are 20 times more efficient than regular fiberglass filters.
In general filters with a rating of merv.
On 10 20 pm particles 19 n a n a virus unattached radioactive materials 99 999.
A low merv rating means that the filter does not remove as many particulates from the air.
Merv 8 rated filters are high quality filters.
The merv filter rating is the domestic and international industry standard rating system established by the american society of heating refrigerating and air conditioning engineers.
Merv 8 filters remove basically the same particulates as a merv 6 but they are more efficient.
Merv air filter ratings range from 1 least efficient captureability to 16 very efficient.
Ashrae stands for the american society of heating refrigerating and air conditioning engineers.
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.
This method tests air cleaning devices for dust removal efficiency.
The test is based on particle size.
The other two systems were created by 3m mpr and the home depot fpr to differentiate their offerings.
