WHAT DOES MERV OR MERV RATING MEAN?


Your filters MERV Rating is a good way to help judge the effectiveness of the filter. MERV means Minimum Efficiency Reporting Value which was developed by the American Society of Heating, Refrigeration and Air Conditioner Engineers - ASHRAE. MERV values vary from 1 to 16. The higher the MERV value is the value the more efficient the filter will be in trapping airborne particles. Another consideration is air flow through the your HVAC system. Leaving a dirty air filter in place or using a filter that is too restrictive may result in low air flow and possibly cause the system to malfunction.


ASHRAE recommends MERV 6 or higher

US Department of Energy recommends MERV 13 LEED recommends MERV 8 at a minimum


See the chart below for filter MERV descriptions:




MERV VALUE

The filter will trap Average Particle Size Efficiency

0.3 - 1.0 Micron

The filter will trap Average Particle Size Efficiency

1.0 - 3.0 Micron

The filter will trap Average Particle Size Efficiency

3.0 - 10.0 Micron


Types of things these filters will trap

MERV 1

-

-

Less than 20%


Pollen, dust mites, standing dust, spray paint dust, carpet fibers

MERV 2

-

-

Less than 20%

MERV 3

-

-

Less than 20%

MERV 4

-

-

Less than 20%

MERV 5

-

-

20% - 34%


Mold spores, hair spray, fabric protector, cement dust

MERV 6

-

-

35% - 49%

MERV 7

-

-

50% - 69%

MERV 8

-

-

70% - 85%

MERV 9

-

Less than 50%

85% or better


Humidifier dust, lead dust, auto emissions, milled flour

MERV 10

-

50% - 64%

85% or better

MERV 11

-

65% - 79%

85% or better

MERV 12

-

80% - 89%

90% or better

MERV 13

Less than 75%

90% or better

90% or better


Bacteria, most tobacco smoke, proplet Nuceli (sneeze)

MERV 14

75% - 84%

90% or better

90% or better

MERV 15

85% - 94%

90% or better

90% or better

MERV 16

95% or better

90% or better

90% or better



Need an HVAC contractor?

Coolray is the company you can depend on when you need an HVAC contractor in Atlanta. We provide expert air conditioning repair, heating repair as well as service and installation of HVAC systems and equipement.