QUOTE(ch_teo @ May 18 2015, 08:54 PM)
I have just done my today. the 5th attempt only succeeded. just as usual. take a deep breath, hold and like "cough" into the mouth holder.
QUOTE(MEngineer @ May 18 2015, 09:11 PM)
The trick the nurse taught me is when you exhale. When you exhale air blow out as hard you can until you feel all the air is out of your lungs and chest depressed prolonging your exhale.
QUOTE(supersound @ May 20 2015, 01:30 PM)
20 times only passed? That's a record.
Do regular exercise, don't use air cond for too long period of time(too long means > 4 hours daily).
Drink less chemical coffee, junk foods from chain restaurants.
5 times still way too much, proper is twice(to verify first blow are correct)
I'm doing this blow test every year and never go beyond 2 times.
Thanks for the advice guys, I've done it today three times all pass. Perhaps because I've stopped smoking since last year.