07-14-2016, 01:52 PM
(This post was last modified: 07-14-2016, 03:14 PM by surferdude2.)
If you only consider the pressure drop as the issue, you can use any reasonable length of 22 mm. hose (up to approx 21 M.) and still be equivalent to an 15 mm. hose at 3 M. length. Since a 22 mm. hose has roughly twice the cross section as a 15 mm. hose, using the larger hose would seem prudent for extending runs beyond the normal.
Unfortunately there are some other factors that can affect the outcome of such trials. Wave shape and rise time are two important factors that can cause the machine to interpret your response to therapy differently, depending on the algorithm in use by the particular machine. The increased volume of the longer and larger hose may have a buffering effect on those two items and could cause a the machine to be less responsive due to the lower instantaneous peaks. You may also detect a delayed pressure response as you inhale, which could be bothersome to some.
I wouldn't hesitate to extend the hose to 6 M. but would be inclined to use a 22 mm. hose (or perhaps one of each) when doing so. I also would be alert for any changes in results that were reported. In the final analysis, what may work well for one may not for another. Not only does the sensitivity of the machine come into play but the sensitivity of the user is also a factor. I'd say, try it and see if it works for you. That presumes that you have enough previous data to detect any untoward change that may immediately occur.