What is a MERV Rating?

The acronym MERV stands for "Minimum Efficiency Reporting Value". MERV ratings are used to rate the ability of an air cleaner filter to remove dust from the air as it passes through the filter. MERV is a standard used to measure the overall efficiency of a filter. The MERV scale ranges from 1 to 16, and measures a filter's ability to remove particles from .30 to 10 microns in size. To give you an idea of the scale of a micron, 100 microns is about the thickness of a piece of paper or a human hair. Filters with higher ratings not only remove more particles from the air, they also remove smaller particles.

MERV ratings are determined by adding particles of varying sizes into a controlled testing environment. The particles are added upstream of the test filter and a laser particle counter samples the air before it enters the filter and after it leaves the filter. The two particle counts are compared to calculate the Particle Size Efficiency of the tested filter. Once this is determined, a MERV Parameters chart is used to determine the MERV rating.

See the MERV Rating Chart below for more information about the difference in performance between filters with different MERV ratings.

For a down loadable version of this page, click here.

MERV

Rating

Dust Spot

Efficiency*

Typical Controlled

Contaminant

Applications

Air Filter

Type

1

<20%

>10.0 micon Particle Size
Pollen, Dust Mites, Sanding Dust, Spray Paint Dust, Textile Fibers, Carpet Fibers

Minimal Filtration

Residential

Window A/C Units

Throwaway Disposable fiberglas or synthetic panel filter

Washable  Aluminum mesh

Electrostatic
Self charging woven panel filter

2

<20%

3

<20%

4

<20%

5

<20%

3.0-10.0 micron Particle Size

Mold Spores, Hair Spray, Fabric Protector, Dusting Aids, Cement Dust, Pudding Mix

Commercial Buildings

Better Residential

Industrial Workplace

Paint Booth Inlet

Pleated Filters
Disposable, extended surface area, thick with cotton-polyester blend media, cardboard frame

Cartridge Filters
Graded density viscous coated cube or pocket filters, synthetic media

Throwaway
Disposable synthetic panel filter

6

<20%

7

25-30%

8

30-35%

9

40-45%

1.0-3.0 micron Particle Size

Legionella, Humidifier Dust, Lead Dust, Milled Flour, Auto Emissions, Welding Fumes

Better Commercial

Superior Residential

Hospital Laboratories

Welding Booth Inlet

Bag Filter
Non-supported microfine fiberglass or synthetic media, typically
6”-36” deep, 6-12 pockets

Box Filter
Rigid style cartridge filters typically 4” - 12” deep, may use lofted or paper media

10

50-55%

11

60-65%

12

70-75%

13

89-90%

.30-1.0 micron Particle Size

All Bacteria, Most Tobacco Smoke, Proplet Nuceli (Sneeze)

Superior Commercial

General Surgery

Hospital Rooms

Smoking Lounge

Bag Filter
Non-supported microfine fiberglass or synthetic media, typically
6”-36” deep, 6-12 pockets

Box Filter
Rigid style cartridge filters typically
4”-12” deep may use lofted or paper media

14

90-95%

15

>95%

16

>95%

* Dust spot efficiency measures a filter's ability to remove large particles,
those that tend to soil building interiors.

Home About Us Products MERV Contact
animated Gulf Breeze Filters logo

5326 Lena Road
  Bradenton, FL 34211

(941) 488-7070

Fax: (941) 486-1002

sales@gulfbreezefilter.com

 Manufacturers of:


 • Aluminum Pad Holding Frames

 • Permanent Electrostatic Filters

 • Aluminum Fresh Air Intake Filters

 • Custom Size MERV 8 Pleats



 Distributors of:


 • Polyester Rolls & Pre-cut Pads

 • Pleated Filters
   (all MERV Ratings)

 • Disposable Filters

 • Box Filters
   (all MERV Ratings)

 • HEPA Filters

 • Paint Booth Filters

 • Bag Filters

Office Hours:

  7:00 A.M. - 5:00 P.M.
  Monday - Thursday

Phone:
  (941) 488-7070

Toll Free:

  800-780-2188

Fax:
  (941) 486-1002

Address:

  5326 Lena Road
  Bradenton, FL 34211


Email:
  sales@gulfbreezefilter.com

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