a question about the nitrogen exit bag method. Is sitting really important?

[wagner2029]

a question about the nitrogen exit bag method.
Is sitting really important? I have a cylinder with 2000 liters of nitrogen, I could adjust it to 20 liters per minute or more.
I have read the guidance to be seated in several places, but the schemes used a large bag and small cylinder, my exit bag is tight on my head and my cylinder has plenty of capacity.
I plan to do it lying down.

 

[HappyForever?]

By lying down, the bag makes contact with the floor, and this increases the chance of the bag breaking.

 

[anonaon]

The whole point of sitting or being slighlty reclinded (optimal position), is to allow CO2 to be purged out effectively but this only applies to exitbags. With SCBA and EEBD, you can CTB lying down

 

[wagner2029]

I bought this one, it seals well, but still allows a little air to enter, I sawed off the pipe and adapted a hose, maybe if I increase the flow to create a positive pressure inside the mask it will work.
I'm still in doubt.