Best passover humidifier?

What are some good passover humidifiers that dispense a high humidity? During power failures I need to use a battery for my cpap which won't run my heated humidfier.

You do know that you can just turn your current heated humidifier off to convert it to passover right?

If you eliminate temperature (ie. no heat) and air flow velocity (ie. set Rx pressure) from the variables that affect humidity ... then the only variable left to maximize your humidity is to increase the surface area of the humidifier reservoir. In other words, you want a passover humidifier that has the largest area footprint.

If you are the crafty type ... you can probably make yourself one real easy.

- r

The Ocean, at the equator, while on a small island. Jim

How often do you experience power failures? and how long do they last?

Maybe a generator would be a better investment like a Honda EU1000 or EU2000.

The Oasis is reported to be the best at delivering moisture, but it bit expensive for what you get if you ask me.

[quote="Anonymous"]What are some good passover humidifiers that dispense a high humidity? During power failures I need to use a battery for my cpap which won't run my heated humidfier.

I'm glad this subject came up. I had been wondering about the impact of surface area, amount of water in humidifier (relative to distance from in/out ports), and the location of ports. Some are opposing-lateral (as in integrated), others are both on top, (as in the HC-150).

Is there an 'ideal' surface area, or is it relative to the xpap machine one is using? I chose a different manufacturer's HH from that of my xpap. Do not have measurements of the intended integrated HH for my xpap, so cannot do a comparison based on surface area.

Any thoughts on this?

The type or brand of machine should have no effect on heated humidification. The ideal surface area is the largest that you can accommodate (as Jim jested … an ocean would be best if you could isolate it into your machine's pressure system). A reservoir designed to maximize the flow of air over the water surface should optimize evaporation. However, I don’t know that having the in/out ports lateral or vertical makes that much of a difference. The ResMed HH has a horizontal inlet and an outlet at 45 degrees and is designed to route the air into a swirl around on the reservoir’s water surface which may help to optimize the evaporation … but I would not know how much of a significant difference it would make, if any.

Increasing surface area increases the number of water molecules available for evaporation while increasing temperature increases the rate at which the water molecules are evaporated. Because the air flow is relatively constant for a given machine pressure, mask, and individual breathing characteristics … water surface area and temperature are the only two variables influencing evaporation. One thing to keep in mind though is that increasing temperature does have a limit on comfort (ie. I don’t think it would be pleasant to inhale hot steam), so beyond a certain temperature … increasing surface area is going to be the only way to increase humidity.

BTW - amount of water has no effect on humidification/evaporation unless of course you run out