Tubing Length

Mebake · Post by **Mebake** » Wed Mar 24, 2010 2:37 pm

I am sure this topic has been approached before on this forum. But please indulge me. Will a longer hose affect how my mask and or CPAP machine treat my OSA? Currently using a 6 ft tubing and would like to use either an 8 ft or 10 ft tubing. Any feedback would be helpful.

LSAT · Post by **LSAT** » Wed Mar 24, 2010 2:51 pm

Up to 10' shouldn't make any signifigant difference in your treatment.

bearded_two · Post by **bearded_two** » Wed Mar 24, 2010 3:01 pm

12' should even be fine, especially if you are using an autoPAP (in auto mode).

GumbyCT · Post by **GumbyCT** » Wed Mar 24, 2010 3:49 pm

Mebake wrote:I am sure this topic has been approached before on this forum. But please indulge me. Will a longer hose affect how my mask and or CPAP machine treat my OSA? Currently using a 6 ft tubing and would like to use either an 8 ft or 10 ft tubing. Any feedback would be helpful.

It is the total length (volume) of the circuit that has the most impact.

When I added a 10ft hose to my HC150 (w/18in hose) and an Activa mask (w/18in hose) my AHI went to zero and I felt terrible. My thought was the M auto bipap could no longer sense any events. I reduced to an 8ft hose and returned to normal again.

Don't forget the HC150 also has the chamber volume to consider.

If you aren't using an auto then it may not matter as much. But there will still be a loss over the length. Sometimes reading the data can be tricky.

BilC · Post by **BilC** » Wed Mar 24, 2010 4:17 pm

From the previous comments, it seems that increasing the length (volume) effects the AHI
So does decreasing the volume act the opposite?

What I am getting at is, can you go to the new thin hose (designed for the S9) and use an S8 auto..

JohnBFisher · Post by **JohnBFisher** » Wed Mar 24, 2010 4:37 pm

BilC wrote:... From the previous comments, it seems that increasing the length (volume) effects the AHI. So does decreasing the volume act the opposite? ...

No. The unit is not able to properly determine the pressure at the mask if the tubing is too long. However, shrinking the tube below that mark does not impact the therapy - other than putting you on a short leash!

BilC wrote:... What I am getting at is, can you go to the new thin hose (designed for the S9) and use an S8 auto..

The pressure is pretty much not impacted by the size of the hose. You need to get it very thin before the resistance impacts therapy. There's lots of physics involved. But essentially, the diameter of the tubing does not matter. The length of the tubing (beyond about 10 feet) will impact the ability of the machine to determine the pressure at the mask.

Hope that helps.

Guest · Post by **Guest** » Wed Mar 24, 2010 5:06 pm

Thanks. I ask that question to one of the online sellers, not the one that sponsors this site, and their reply was that I could only use the thin hose on the cpap it was designed for.

So much for their advice.

roster · Post by **roster** » Wed Mar 24, 2010 6:10 pm

Hose length does affect the effectiveness of your therapy. For example, if your head is eight feet from the machine and you are using a six-foot hose, you will have a large leak all night.

JohnBFisher · Post by **JohnBFisher** » Wed Mar 24, 2010 6:33 pm

roster wrote:Hose length does affect the effectiveness of your therapy. For example, if your head is eight feet from the machine and you are using a six-foot hose, you will have a large leak all night.

LOL! Well, if that's the problem, just add the extension to the hose:

Tubing Length

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Mask	Humidifier

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