Finally...Having trouble posting...I noticed the cough assist post was removed too. How did your dad just happen to buy one of these? is he in the medical field? and are you using it? it was made for people with paralyzed breathing muscles to induce coughing. I could see how it might benefit CF. But I would worry that it could damage lungs....I cant tember who posted it. but are you using the machine and hows it working for CF...I have alot of trouble coughing stuff up...have pep flutter , percdussor etc....