S
Shunya
Member
- Oct 23, 2023
- 77
what about an Eebd hood? Seems like there's be a lot of residual oxygen left behind.For me , this concern went away once I ran tests and se how it works .
When you scrunch all the air out of the bag prior to turning gs on , then allow the bag to inflate , once it's fully inflated .. it's fully inflated with nitrogen , with some residual oxygen that didn't make it out from
Scrunching . But . All of the gas / air inside is being replaced with fresh nitrogen at a high rate , and gets forcefully blown out of the bag , around the neck : you can feel the gas rushing at a high rate around the neck .
Theoretically, the elastic could like … not be tight at all, but the the slight positive pressure stops all ambient air from coming in . This being said , I still would prefer snug fit with the elastic
Once you play around with the tightness of your elastic , and conceptually understand the positive pressure of the bag, and experience it , you'll feel better
You could also just put the bag over your head and tighten the elastic without any gas flowing , to get a sense of the positive pressure. Put it on and press on the bag and notice that the air in the bag doesn't really escape unless you pres hard enough .
Also , you could just get a dummy head , and oxygen sensor and run a test on the dummy head
I did this a few times, and the air in the bag ws like 95-96% Once tho e bag ws fully inflated . Then as more air gets pushed and replenished by fresh nitrogen this slowly crept up to 97..98…99 over a couple minutes
Mine looks like this.

What would the protocol be?
1. Allow the nitrogen to fill up the hood while it's on your head
2. Hyperventilate before pulling the hood down which with isn't really fast. Might have to practice holding my breath for atleast a minute
Is there anything I'm missing?