Method Exit bag and inert gas megathread

[scientificmethid]

I've seen the standard 25 L/min nitrogen flow rate mentioned in multiple sources (like PPEH), but I suspect that number has more to do with regulator limitations than optimal gas flow. Many click-style regulators top out at 25 L/min, which may have set the standard by default.

My current setup provides 40 L/min total:

• Tank A: 25 L/min into the EEBD hood's main inlet (which includes a built-in exhalation valve)
• Tank B: 15 L/min through a second line routed like in a standard exit bag configuration into the EEBD hood.

This configuration seems solid, but I'm open to upgrading the second regulator if there's a meaningful benefit to reaching 50 L/min total. I'm not trying to scrape by on "good enough." I want certainty, and I want to ensure the least suffering possible—rapid oxygen displacement, continuous CO₂ flushing, and no physiological surprises.

For reference, EEBDs used in fire escapes recommend 36-40 L/min just to support high ventilation and toxic gas clearance. Since nitrogen is inert, and since there's no oxygen support involved, it seems reasonable to meet or exceed that benchmark.

One side note: I'm not at all concerned about sound or airflow. I sleep with a fan pointed at my face every night—so if anything, the sensation of gas moving near my face will feel familiar, maybe even comforting.

If anyone with technical experience or first-hand insight sees an issue—or has thoughts on whether going from 40 L/min to 50 L/min meaningfully improves outcomes—I'd really appreciate your input.

40/L per minute seems like a lot. That's a lot of air moving and I think you'll have major leaks around your mask seal from sheer volume of air movement at 40/LPM+

 

[OutOfTime]

male CGA580 to female G5/8" adapter

Thank you very much.

I've looked for this and all I can find are male to male adapters like in this picture. Is there anywhere anyone knows that sell "male CGA580 to female G5/8" adapter"

 

[bored2death]

Thank you very much.

I've looked for this and all I can find are male to male adapters like in this picture. Is there anywhere anyone knows that sell "male CGA580 to female G5/8" adapter"

they exist on european websites and some online auction sites. i dont want to violate TOS by saying more

 

[th3_t1r3d_0n3]

Hi. Would a 9kg LPG cylinder be enough gas for using an exit bag? There isn't much info on using LPG, does the PPH cover this?

 

[plytiene]

Hi. Would a 9kg LPG cylinder be enough gas for using an exit bag? There isn't much info on using LPG, does the PPH cover this?

I don't think LPG is an inert gas, so it does not lead to a peaceful death by the PPH standards and isn't discussed by them. Inert gases are Helium, Nitrogen, Argon. The latter two are the recommended ones due to being available via welding supplies, while Helium became more regulated with exit bags becoming more in vogue.

 

[th3_t1r3d_0n3]

I don't think LPG is an inert gas, so it does not lead to a peaceful death by the PPH standards and isn't discussed by them. Inert gases are Helium, Nitrogen, Argon. The latter two are the recommended ones due to being available via welding supplies, while Helium became more regulated with exit bags becoming more in vogue.

It should be though because in South Africa there are are couple of cases where entire families die from household LPG leaks.

 

[OutOfTime]

they exist on european websites and some online auction sites. i dont want to violate TOS by saying more

Would you be open to DMing me the websites? I believe it is acceptable if it is in private messages. I would really appreciate it as I am desperate to have my setup.

 

[kreikrei]

Sent you a PM

So the Hood quick connect plug is 1/4" according to Zardofan's post.
From what I can tell in the hood photo...that fitting is a Hi-Flo V style...which they call 'H' below.


View attachment 161954

There are also universal female couplers that all the plug styles can fit into.

View attachment 161956

Hi, can you please send the search term for ebay as well?
I already have a 99.99% 1500 liter argon cylinder and a suitable pressure regulator, just need the connections and to finally choose the most suitable mask TYPE :)
Thank you!

 

[plytiene]

Did youtube purge exit bag construction guides? The OP strongly recommend watching them but youtube itself wards off searching and search engines don't seem to find them onto it either.

E: Oh, that's the video in the resource thread compilation. I'm an idiot.

Spoiler