Within 30 days from the Invoice date Unless another return policy is indicated on the item, products sold by Commercial Filter Service, Inc. The filter's performance, on each of the twelve particle sizes, during the six test cycles a total of 72 measurements is determined. Data such as average efficiency, arrestance and dust holding capacity which are provided by
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ANSI/ASHRAE Standard Edition
Using the lowest measured efficiency avoids the fiction of averaging and provides a "worst case" experience over the entire test.
The filter's performance, on each of the twelve particle sizes, during the six test cycles a total of 72 measurements is determined. For each measurement, the filtration efficiency is stated as a ratio of the downstream-to-upstream particle count. Seventy-two 72 data points are reduced into a single curve that typifies the minimum efficiency of a filter. What is the Return Policy?
Frequently Asked Questions
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. Within 30 days from the Invoice date Unless another return policy is indicated on the item, products sold by Commercial Filter Service, Inc.
Do this for all three groups. The lowest values over the six test cycles are then used to determine the Composite Minimum Efficiency Curve Note: An air filter's performance is determined by measuring the particle counts upstream and downstream of the air-cleaning device being tested.
Commercial Filter Service, Inc. The use of mandatory code language, which enables the standard to be referenced by other ztandard that are developed. The twelve size ranges are placed in three larger groups according to the following schedule: If you have further questions please feel free to contact us by using our contact us page and we will be happy to assist you further.
The challenge aerosol is injected into the test duct and particle counts are taken for each of the size data points.
This table is intended to be a general guide to filter use and does not address specific applications or individual filter performance staneard a given application. MERV is expressed on a 16 point scale and is derived from the particle size ranges.
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. Data such as average efficiency, arrestance and dust holding capacity which are provided by Final resistance must be at least twice the initial resistance at the test airflow rate, or the values in Table 3, whichever is greater. Refer to manufacturer test results for additional information.
Please note that the original and return shipping and handling charges will NOT be refunded or reimbursed under any circumstances. This will generate particles covering the 12 required particle size ranges for the test See Table 2. An "overall" reporting value of a The MERV is a single number that is used along with the air velocity at which the test was performed; to simplify the extensive data generated by the method of testing.
Average Arrestance By Standard 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 stanxard for five additional measurement cycles.
What Does Efficiency Mean?