Eric in vb2008 you said you used 1 litre over FRC why is this? Just for equalizing or breathhold. How are you finding consistancy with this as i find frc realy quite acurate but anything more seems a bit off (checked with spirometer). You are exhaling down to this right not inhaling up. You also used a neck weight and had the weight of the mono too this would have to be a few kgs.
Thanks Nat
PS 67 frc you da man
