Table 2.

Face velocity, and surface area and configuration of masks used in the NIOSH NaCl, PFE, BFE, and VFE test methods.

		Face Velocity (cm/sec)
Type	Model	NIOSH NaCl	PFE	BFE	VFE
N95 FFR	A, B, C, D, F	9.3(150 cm2)	3.1(150 cm2)	3.1(150 cm2)	3.1 (150 cm2)
	E	9.3(150 cm2)	3.1(150 cm2)	10.5(45 cm2)	10.5(45 cm2)
Surgical N95 FFR	G, H	9.3(150 cm2)	3.1(150 cm2)	3.1(150 cm2)	3.1(150 cm2)
	I	9.3(150 cm2)	3.1(150 cm2)	10.5(45 cm2)	10.5(45 cm2)
Surgical Mask	J, K, L	14.2(100 cm2)	5.2(90 cm2)	10.5(45 cm2)	10.5(45 cm2)

Numbers in parentheses show surface area of materials tested.

No shading - Entire mask (150 cm²); Light shading - Mask material (100 cm²)

Medium shading - Mask material (90 cm²); Dark shading - Mask material (45 cm²)