Table II.

Fit quality of model (≥100 represents a good fit)

Fabric	Form	Overall fit factor
IIR-surgical maska	Surgical mask	4
3M 1862+a	FFP2	134
ePM₁ 85%	American model (flat)b with nose strip	22
ePM₁ 85%	American model (flat) with nose strip and foam	57
ePM₁ 85%	Belgian model (pleated)b	15
ePM₁ 85%	Belgian model (pleated) with nose strip and foamb	18
ePM₁ 85%	Duckbill with seam on inside with nose strip and foam	130
ePM₁ 85%	Duckbill with seam on outside with nose strip and foam	120
ePM₁ 85%	Flat (folded) (with quilt cloth) with nose strip and foam	56
ePM₁ 85%	Indian model (pleated) (with quilt cloth) with nose strip	8
ePM₁ 85%	Indian model (pleated) with nose strip	67
ePM₁ 85%	Other model (pleated)b with nose strip	36
ePM₁ 85%	Round with nose strip	79

^aReference.

^bThe filter was inserted.