Approximate Duration Of Oxygen Cylinders
M2 cylinder								M4 cylinder
O2 capacity			Cylinder Weight					O2 capacity			Cylinder Weight
40 liters			1.4 lbs					113 liters			2.3 lbs
Regulator								Regulator
Liter Flow	1	2	3	4	5			Liter Flow	1	2	3	4	5
Hours	0.7	0.3	0.2	0.2	0.1			Hours	1.9	1	0.6	0.5	0.4
Conserving Device								Conserving Device
Liter Flow	1	2	3	4	5			Liter Flow	1	2	3	4	5
Hours	2.4	1.5	1.2	0.9	0.8			Hours	6.7	4.3	3.2	2.6	2.1
M6 cylinders								ML6 cylinder
O2 capacity			Cylinder Weight					O2 capacity			Cylinder Weight
165 liters			2.9 lbs					165 liters			2.9 lbs
Regulator								Regulator
Liter Flow	1	2	3	4	5			Liter Flow	1	2	3	4	5
Hours	2.7	1.4	0.9	0.7	0.5			Hours	2.7	1.4	0.9	0.7	0.5
Conserving Device								Conserving Device
Liter Flow	1	2	3	4	5			Liter Flow	1	2	3	4	5
Hours	9.8	6.3	4.7	3.8	3.1			Hours	9.8	6.3	4.7	3.8	3.1
D cylinder
O2 capacity			Cylinder Weight
425 liters			6.0 lbs
Regulator
Liter Flow	1	2	3	4	5
Hours	7	3.6	2.3	1.8	1.4
Conserving Device
Liter Flow	1	2	3	4	5			E cylinder
Hours	25.3	16.1	12.2	9.8	8.1			O2 capacity			Cylinder Weight
								680 liters			8.6 lbs
								Regulator
								Liter Flow	1	2	3	4	5
								Hours	11.3	5.7	3.8	2.8	2.3
								Conserving Device
								Liter Flow	1	2	3	4	5
Regulator				Conserving Device				Hours	40.5	25.8	19.6	15.7	12.9