Closed Circuit Double Douglas Bag Set

This closed circuit double Douglas bag set can be used in an extensive range of tests including:

• Metabolic rate before, during and after exercise
• Effects of humidity and temperature on ventilation
• Calculation of oxygen consumption
• Effects of breathing high and low CO₂ concentrations on ventilation, respiratory rate and O2 consumption

Features:

• Soft, flexible, ethylene vinyl acetate copolymer tubing
• 30 mm ID tubing has nearly 50% greater cross-sectional area than traditional 22 mm ID tubing
• Tubing has extremely low profile annular rings resulting in minimum distortion on bending so that maximum cross-sectional area is maintained
• One-way air valve with mica discs
• Absorbent indicator canister can be set directly in the circuit at any point

The 50-1049 double channel tubing valve has two settings. The first setting allows exhaust air from the test subject to be routed to the atmosphere. The second setting connects the subject’s inspiratory tube to the gas supply bag and the expiratory tube to the gas collection bag. Residual volume, functional residual capacity and total lung capacity can also be tested by adding an additional 50-1049 tubing valve at the mouth of one of the bags.