Transcend Micro Auto Travel CPAP Machine

I purchased a Transcend Micro Auto Travel CPAP Machine and the exhale does not seem to work. I increased the setting through my computer to the max - 3. That made very little difference. I have been searching for others with the same problem and found a Reddit board talking about it but that is all. I have used a CPAP for many years so I know how it is supposed to 'feel'. I have called my supplier who claims not to have never had a customer with this problem. I took it out of the box - set it up - changed the exhale settings. They will not take it back. I would welcome any suggestions and/or advice.

nataliequeue wrote: ↑

Wed Apr 29, 2026 1:45 pm

I would welcome any suggestions and/or advice.

Your supplier should have a manometer and be willing to check your machine. If he's a real asshole and refuses, you can do it yourself:

https://www.youtube.com/watch?v=XMzt4i3kgrM

https://cpapmyway.com/products/cpap-flo ... 8b46&_ss=r (I haven't price checked with other suppliers.)

ChicagoGranny wrote: ↑

Thu Apr 30, 2026 12:37 pm

nataliequeue wrote: ↑

Wed Apr 29, 2026 1:45 pm

I would welcome any suggestions and/or advice.

Your supplier should have a manometer and be willing to check your machine. If he's a real asshole and refuses, you can do it yourself:

https://www.youtube.com/watch?v=XMzt4i3kgrM

https://cpapmyway.com/products/cpap-flo ... 8b46&_ss=r (I haven't price checked with other suppliers.)

I thought those manometers were only accurate to within 2cm H2O. I thought about buying one myself until I saw that.

Mark435 wrote: ↑

Thu Apr 30, 2026 2:51 pm

I thought those manometers were only accurate to within 2cm H2O. I thought about buying one myself until I saw that.

I think even the cheap ones are accurate.

I don't care to have my machine checked with a manometer. If my stats (machine display, OSCAR, or SleepHQ) are good, then I'm good.

Example: Let's say my setting is 10.0 and the machine is blowing 8.0. But my stats are good, why worry? If it's blowing 12.0 and only 10.0 is needed, that can also be seen in the pressure line graph, and I can decrease the machine pressure setting.

By the same method, the EPR can be observed.

ChicagoGranny wrote: ↑

Thu Apr 30, 2026 3:16 pm

Mark435 wrote: ↑

Thu Apr 30, 2026 2:51 pm

I thought those manometers were only accurate to within 2cm H2O. I thought about buying one myself until I saw that.

I think even the cheap ones are accurate.

I don't care to have my machine checked with a manometer. If my stats (machine display, OSCAR, or SleepHQ) are good, then I'm good.

Example: Let's say my setting is 10.0 and the machine is blowing 8.0. But my stats are good, why worry? If it's blowing 12.0 and only 10.0 is needed, that can also be seen in the pressure line graph, and I can decrease the machine pressure setting.

By the same method, the EPR can be observed.

To further support this point, if one is in APAP mode and the device is blowing wrong it doesn't matter. The machone will increase pressure as it needs to.

Example:
if your machine is blowing 2 cm low, and events are icurring it will increase pressure to address. Narrow the ninimum pressure as you would if the pressure was spot on.

I don't directly know about the Transcend machine but I have similar experience with the Breas Z1 machine. It has 3 levels of pressure relief, none of which actually provide pressure reduction during exhale, in fact the pressure actually increases during exhale. In CPAP mode the pressure isn't at all constant but increases during exhale and decreases during inhale. The diagram in the manual actually shows this, but with less pressure swing when "Z-breathe" is turned on. My impression is that its a very tiny machine with a very tiny blower motor that can't slew pressure quickly. It may be that the Transcend machine is likewise a very tiny machine with a very tiny motor, I don't know this for a fact but what you describe is very familiar. The Resmed AirMini uses the same blower motor as the S11 so it's got the power needed to change pressure very quickly.

Per the manometer discussion, I have a CPAP manometer. The problem is they read a static pressure, not the dynamic pressure during breathing. I made a T fitting so I could connect it along with a mask. A Resmed machine in CPAP mode with no EPR is pretty close to constant pressure, but with interesting changes between full face and nasal pillow settings. With the Breas machine the pressure increases when you exhale and decreases when you inhale. It's more complex when the Z-Breathe is enabled, the machine is trying to decrease pressure on exhale, but the effect comes half way through exhale. The Resmed machine with EPR in CPAP mode does what you expect, the pressure decreases when you exhale and increases when you inhale.

But I traveled extensively with the Breas Z1 and had pretty good results, at least back then, (was 7+ years ago). It didn't track events so this is a subjective impression. I tried it recently preparing for a long vacation and couldn't tolerate it anymore so I traveled with my Resmed S10.

mlmollenkamp wrote: ↑

Fri May 01, 2026 12:14 pm

It has 3 levels of pressure relief, none of which actually provide pressure reduction during exhale, in fact the pressure actually increases during exhale.

That doesn't seem to be correct. See,

Pressure swings occur as a spike in pressure during exhalation
and a drop in pressure during inhalation. Z-Breathe is designed to eliminate the spikes and drops
while keeping the pressure constant, thereby delivering more comfortable therapy.

Page 18 - https://shop.breas.com/wp-content/uploa ... er%20Guide.

Have you misinterpreted the graph on page 18? It's not a typical pressure graph. It's a comparison of the Z-Breathe settings to the Z-Breathe settings turned off.

The Z-Breathe setting is different and would feel different from ResMed EPR settings.

The increase in pressure, and the shape of the pressure curve were by direct observation with a manometer. But even by the graphs Z breath reduces the pressure swings but doesn't eliminate them. And I can definitely feel the pressure go up during exhale.

This is how the algorithm/machine is designed to work ---->

Yes, the Z-Breathe™ algorithm on the Breas Z1 travel CPAP machine (and its successor, the Z2) is designed specifically to reduce pressure during exhalation.Here is how the Z-Breathe algorithm works to provide comfort: Pressure Relief: The algorithm detects the exhalation phase of your breathing cycle and lowers the pressure to make breathing out feel more natural and comfortable.

BTW, how it feels to you when you are awake is unlikely to be how it works when you are sleeping.

Sorry you are having problems.