MERV is an acronym for MINIMUM EFFICIENCY REPORTING VALUE.
MERV is a relative performance rating system created by ASHRAE (American Society of Heating, Refrigerating, and Air Conditioning Engineers) to measure filter performance.
MERV measures the filter's ability to capture a variety of airborne particles – from large particles measured in microns down to sub-micron particles.
The higher the MERV rating the better the filter is at removing substances from your air.
MERV ratings are assigned to air filters or filter media that have been tested to an ASHRAE test standard.
ASHRAE test standards and MERV ratings are an accepted industry standard for measuring filter performance
The test standard is designed to test the effectiveness of the filter in removing a specific range and amount of particles in the air.
MERV tests are typically performed by independent third-party labs.
WHAT IS FPR?
FPR – Filter Performance Rating – is a proprietary filter rating system created by The Home Depot.
The rating system measures the filter's ability to capture (1) large particles (2) small particles and (3) weight gain (filter lifetime).
The higher the rating the better the filter.
This is not an industry recognized standard
WHAT IS MPR?
MPR – Microparticle Performance Rating – is a proprietary filter rating system created by The 3M Company.
MPR is not an accepted industry standard.
The 3M rating system seems to place an emphasis on the filters ability to capture smaller particles (e. g. sub-micron) that are used in a MERV test.
It should be noted most common allergens tend to be larger than the particle sizes emphasized in the MPR test.
WHAT IS ANTIMICROBIAL PRODUCT PROTECTION?
It means we have built into the filter media ingredients that protect the filter which protects your air.
Antimicrobial Product Protection (AMPP) is designed to help prevent the uncontrolled growth of odor causing microbes on the surface of the filter.
Microscopic airborne organisms are often trapped on high performance filters which left unchecked could multiply and negatively impact filter longevity and performance.
The AMPP in our filters has not been tested to determine airborne microorganism reduction in the air stream.
WHAT IS PRESSURE DROP?
This is a term used in air filtration test standards designed to measure the ability of the filter to allow air to pass through the filter.
Typically, you want a filter to have a high MERV rating without too much pressure drop.
The higher the pressure drop the harder your HVAC system must work to pull air through the filter.
Our air filters are tested for pressure drop. Filters are designed not to exceed ASHRAE (American Society of Heating, Refrigerating, and Air Conditioning Engineers) standards for pressure drop.
WHAT IS THE SIZE OF A MICRON?
A micron is a unit of metric measurement for length also known as a micrometer.
1 micron = 0.001 mm or 0.000039"
This unit of measure is very common to the ASHRAE / MERV testing.
For instance, Mold Spores measure 10 -30 microns. Pollens range from 10-1,000 microns. These common allergen particles are not submicron sized particles.
Airborne particles range in different particle sizes. MERV tests measures airborne particles in microns for 3 different size classes: 0.3 – 1.0 micron; 1.0 – 3.0 microns; 3.0 – 10.0 microns
WHAT IS DUST SPOT EFFICIENCY?
“Dust Spot Efficiency” was removed in the updated ASHRAE test standard 52.2.
Arrestance has since replaced Dust Spot Efficiency in the updated standard.
It is a measure of filter efficiency that measured the ability of the filter to remove particles.
WHAT IS ARRESTANCE?
ASHRAE arrestance is the ability of a device to remove ASHRAE dust from test air.
MERV is the rating system used to describe the filter's arrestance or efficiency in reducing airborne particles
WHAT IS THE 9600, 9100, 8500 RATING ON THE DUPONT™ BRANDED PRODUCTS?
This number is part of the product description – for example ProClear™ Superior 8600™.
The number is assigned to the filter description and represents an approximate performance level of the filter.
HOW DO YOU SELECT AN AIR FILTER?
If you are interested in only protecting your HVAC system while minimizing strain on the system, then you can focus on lower MERV rated filters.
If you have a member in your household that is sensitive to airborne allergens or that may have a medical condition that will be agitated by dust, pollen, and other airborne particles then you should shop for a filter with a higher MERV rating.
You could also consider alternating the levels of filtration seasonally to help save on money. Install higher MERVs during pollen season and lower MERVs when pollen is not in season.
HOW OFTEN SHOULD I CHANGE MY AIR FILTER?
While most standard 1” and 2” pleated filters indicate the filter can last up to 90 days, we recommend checking your filter every 30 days.
Fiberglass filters have a recommended change out period of every 30 days.
Each home environment is different- pets, remodeling/construction, smoking can all impact filter life.
Based upon your home’s environment you may need to change your filter more often than the stated filter life.
Some HVAC systems are designated to hold 4’/5” filters. These Residential Air Cleaner filters – 4”/5” pleated filters - can last from 6-12 months depending upon the filter. Again, it is recommended to check the filter regularly.
HOW DO I INSTALL MY HVAC FILTER?
TURN FAN OFF - Always turn the system or fan to OFF before removing the existing filter.
REMOVE PACKAGING FROM NEW FILTER - Carefully remove the plastic wrap and or label from new filter.
RECORD INSTALL DATE – Record the date in the space provided on the new filter.
AIR FLOW ARROW – Very important that this arrow is pointed in the right direction. To prevent filter collapse It should point towards the system/fan. These are found only on our pleated filters.
Fiberglass filters (without metal) do not have air flow arrows and will function as well regardless of which side of the filter faces the system.
Washable and/or Cut-to-Size filters must have the plastic grid between the filter pad and the motor/system. In other words, the air flows through the filter pad and then exits out the grid side.
WHY DOESN’T THIS FILTER HAVE AN AIR FLOW ARROW?
Only our pleated and washable/reusable air filters have air flow directional arrows.
Fiberglass air filters do not have air flow directional arrows since it does not matter which size of the filter the air flows through.
See “How Do I Install My HVAC Filter?” for additional details.
HOW DO I CLEAN THIS WASHABLE FILTER AND HOW OFTEN?
We recommend washable/reusable filters be cleaned monthly.
Regular cleanings of the filter media are required to prevent the filter from clogging and to prevent equipment malfunction or damage.
Be sure the media is completely dry before reinstalling the filter in your system.
Please visit the page on this website that has the washable / reusable filter you have and download the label for cleaning instructions.
Cleaning instructions are on the product label.
DOES THIS FILTER HAVE A WARRANTY?
Yes, all filters have a warranty please see product label for exact warranty.
Essentially all our warranties are very similar. They read something like this . . .
Products will be free from defects in material and manufacture.
Warranty period is generally 1 year from date of purchase.
Remedy for defective products shall be replacement of the product or a refund of the purchase price at PPA Industries, Inc.
See product label for specifics as it relates to your filter.
Warranties are invalid if the product is modified or proper use and maintenance were not followed.
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