Monaj,
Once my doctor and his respiratory physical therapist decided I was a candidate for a Vest, I was fitted into two vests. The first was the Hill Rom 105 Vest and the second was a battery operated portable one. I could not bear the weight of the battery operated one and had to take it off before turning it on. The HR 105 vest was more welcoming for me. I use mine twice daily with 7% saline and Albuterol. It helps clear some mucous plugs in the morning, but none in the evening. I was asked to continue the evening sessions, nonetheless. My pulmonologist at NJH said “What doesn’t come out in the evening will come out in the morning.” So, I don’t labor any more and I don’t spend 2 hours/session any more. It is 30 minutes/ session, twice daily.