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28 kwi 2022 · MERV and Pressure Drop – What Makes the Difference? There are a number of factors that determine what the resistance to airflow of a new, clean filter (Initial Resistance, or IR) and the resulting pressure drop will be:
So, the pressure drop of MERV 10 is about 30% higher than MERV 8 pressure drop. Most AC and furnaces units can handle using MERV 10, MERV 11 with the expected lifespan of 15-20 years. No need to use MERV 8 and get lower filtration levels.
We are going to look at a rough MERV filter pressure drop chart to see the differences (focusing on MERV 8, MERV 11, and MERV 14 filters, since we use these ones in air conditioners and furnaces the most). This is vital to understand when we should pick MERV 8 vs 11 vs 14 for your HVAC appliance.
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The amount of the HVAC’s air flow slowed by the filter is equivalent to the filter’s pressure drop. Typically, the higher the MERV rating, the higher the pressure drop and the more restrictive the air flow is. Pressure drop directly corresponds to a filter’s air flow rate.
(MERV). 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. MERV is expressed on a 16 point scale and is derived from the PSE for each of the three groups. (See Table 3: MERV Parameters.)
8 gru 2020 · Look for a filter with a similar pressure drop to the filter you have, or make sure your system can accommodate the upgrade. If possible, look for MERV-A 13-A filter if you can get that information. If not, try for a MERV 13 or higher filter.
