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I have a question..shouldn't my DME know about this stuff?
Dan Lyons said:The anti-asphyxiation valve, to which it sounds like you are describing, will close or partially close if it becomes obstructed. You can manually simulate it by simply placing your finger over the exterior opening. When you remove your finger, you get a pressure "thump". The same thing happens if blankets, or other foreign materials should block the valve port.
The reason that this occurs is that a negative air pressure develops on the outward side of the flapper when the port is blocked. It doesn't affect the valves operation. The "shock" and sound are just startling.
Several suggestions:
1. Review your sleep environment.
2. Look at your sleep positions.
Adjust accordingly to minimize blocking the port.
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