The AFT15B is designed for very high volume and rate expired gas analysis measurements (e.g. VO2 or RER measurements). The AFT15B incorporates dual baffles and flexible connection ports capable of interfacing with 35mm or 22mm breathing circuits. Two female Luer connection ports are provided between the baffles for simultaneous monitoring of O2 and CO2 concentrations. Shown with AFT20 (not included)