Q&A – What is the Delta P and BFE of Berkshire’s face masks?

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Q&A – What is the Delta P and BFE of Berkshire’s face masks?

The Differential Pressure (DP) is a test that measures how easily air is passed from one side of the mask to the other. This indicates how easily the wearer can breathe through the mask and is indicated by the Delta P. Higher DP indicates air is more difficult to push through. This could result in a “blow-by” effect (escape of air, and contamination from the sides of an improperly working mask), or even incorrect use by the wearer. While not as comfortable for the wearer, the higher Delta P results in better filtration.

Choice® Face Mask Part Number

Differential Pressure (mm H20/cm)

CHFM1804B

4.5

CHFM180241

4.5

BCR® Face Mask Part Number

Differential Pressure (mm H20/cm)

BM180ELK25I

4.8

BM180ELK50B

4.8

BM210ELK50B

4.8

BM210HBPU50B

4.8

Score

Perception

Above 5.0

Hot

4.0 to 5.0

Very Warm

3.0 to 4.0

Warm

2.0 to 3.0

Cool

1.0 to 2.0

Very Cool

The Bacterial Filtration Efficiency (BFE) tests face mask filtration material. The results are expressed in the % of bacteria larger than 3.0µm (microns) that are being filtered by the face mask. How small is a micron? 

How Small is a Micron?*

HEPA VS. ULPA IN A [Read More...]

Choice® Face Mask Part Number

Bacterial Filtration Efficiency (%) 3.0µm

CHFM1804B

99.7

CHFM180241

99.7

BCR® Face Mask Part Number

Bacterial Filtration Efficiency (%) 3.0µm)

BM180ELK25I

99

BM180ELK50B

99

BM210ELK50B

99

BM210HBPU50B

99

Click here to view an infographic explaining the proper way to wear a face mask.

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