Table 2. Estimated filter efficiency derived from fit factors obtained from the PortaCount Pro 8048.

Respirator	Condition	Estimated Filtration (%)	Δ Estimated Filtration (%)
3M 1860	Untreated	99.50	–
3M 1870	Untreated	99.48	–
BLS 120B	Untreated	99.50	–
Bacou Willson 801	Untreated	96.74	–
3M 1860	Autoclaved	91.67	-7.83
3M 1870	Autoclaved	98.39	-1.11
BLS 120B	Autoclaved	98.46	-1.04
Bacou Willson 801	Autoclaved	90.00	-7.22
3M 1860	100°C	99.50	0.00
3M 1870	100°C	99.48	-0.02
BLS 120B	100°C	99.50	0.00
Bacou Willson 801	100°C	96.74	-0.48
3M 1860	80°C	99.50	0.00
3M 1870	80°C	99.50	0.00
BLS 120B	80°C	99.50	0.00
Bacou Willson 801	80°C	96.67	-0.56