Ashrae standard 52.2

The filter's performance, on each of the twelve particle sizes, during the six test cycles a total of 72 measurements is determined. The twelve size ranges are placed in three larger groups according to the following schedule: More Information about Publications To contact an RTI author, request a report, or for additional information about publications by our experts, send us your request. An air filter's performance is determined by measuring the particle counts upstream and downstream of the air-cleaning device being tested. The standard presents procedures for measuring the filtration efficiency of general ventilation filters over the particle diameter size range from 0.

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FAQ: What is a MERV Rating? | homesweethome.site

How Data Is Obtained An air filter's performance is determined by measuring the particle counts upstream and downstream of the air-cleaning device being tested. Seventy-two 72 data points are reduced into a single curve that typifies the minimum efficiency of a filter.

Research Triangle Park, NC: Data such as average efficiency, arrestance and dust holding capacity which are provided by The filter is first evaluated in its clean condition for filtration efficiency and initial pressure drop. This table is intended to be a general guide standaed filter use and does not address specific applications or individual filter performance in a given application.

Frequently Asked Questions

The filtration efficiency of the filter is then evaluated after each of five dust loading steps. Do this for all three groups. The MERV is a single number that is used along with the air velocity at which ashraae test was performed; to simplify the extensive data generated by the method of testing.

By continuing to use our website, you agree to the use of cookies. Average Arrestance By Standard This will generate particles covering the 12 required particle size ranges for the test See Table 2. The use of mandatory code language, stnadard enables the standard to be referenced by other codes that are developed.

Refer to manufacturer test results for additional information. If you have further questions please feel free to contact us by using our contact us page and we standzrd be happy to assist you further.

Please note that the original and return shipping and handling charges will NOT be refunded or reimbursed under any circumstances. An air filter's performance is determined by measuring the particle counts upstream and downstream of the air-cleaning device being tested. To contact an RTI author, request a report, or stanndard additional information about publications by our experts, send us your request.

The standard presents procedures for measuring the filtration efficiency of general ventilation filters over the particle diameter size range from 0. Commercial Filter Service, Inc.

Minimum Efficiency Reporting Value | Protecting Building Occupants

For each measurement, the filtration efficiency is stated as a ratio of the downstream-to-upstream particle count. RTI uses cookies to offer you the best experience online. If you would like to know more about cookies and how to manage them please view our Privacy Policy. The twelve size ranges are placed in three larger groups according to the following schedule: A laboratory aerosol generator, which operates much like a paint sprayer, is used to create a challenge aerosol of known particle size in the air stream.

What is the Return Policy? MERV is expressed on a 16 point scale and is derived from the particle size ranges. What Does Efficiency Mean? Particle counts are taken over the range of particle sizes six times, beginning with a clean filter and then after the addition of standard synthetic ASHRAE dust loadings for five additional measurement cycles.

Final resistance must be stanvard least twice the initial resistance at the test airflow rate, or the values in Table 3, whichever is greater. The filter's performance, on each of the twelve particle sizes, during the six test cycles a total of 72 measurements asheae determined.

The challenge aerosol is injected into the test duct and particle counts are taken for each of the size data points. An "overall" reporting value of a The lowest values over the six test cycles are then used to determine the Composite Minimum Efficiency Curve Note: Using the lowest measured efficiency avoids the fiction of averaging and provides a "worst case" experience over the entire test.

More 552.2 about Publications To contact an RTI author, request stanvard report, or for additional information about publications by our experts, send us your request.

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