Table 2.

Estimated maximum visible smoke dispersal distances, with geometrical correction, at peak of exhalation, for each oxygen mask and for each respiratory model number shown in Table 1

Oxygen mask type	Oxygenflow rate (L/min)	Respiratory model number	Estimated maximum visible dispersal distance ± geometrical correction (cm), (ie, the difference in the ratios x1/x2 and y1/y2)
Simple	10	1	9.5 ± 0.6 (ie, about 6%)
	10	2	12.5 ± 0.8
	10	3	8.3 ± 0.5
	15	1	11.2 ± 0.7
	15	2	20.7 ± 1.2
	15	3	16.3 ± 1.0
Nonrebreathing	8	1	34.1 ± 3.1 (ie, about 9%)
	8	2	35.8 ± 3.2
	8	3	23.5 ± 2.1
	10	1	24.6 ± 2.2
	10	2	24.6 ± 2.2
	10	3	26.3 ± 2.4
Venturi-type	6 (35% O2)	1	27.2 ± 1.1 (ie, about 4%)
	6 (35% O2)	2	33.8 ± 1.4
	6 (35% O2)	3	27.4 ± 1.1
	6 (40% O2)	1	39.7 ± 1.6
	6 (40% O2)	2	39.7 ± 1.6
	6 (40% O2)	3	26.3 ± 1.1

NOTE. Each of the value of percentages shown are in the last column (6%, 9%, 4%) applies, approximately, to all measurements made for that particular oxygen mask type.