Method My respirator setup

[ToughLife]

Hi I am new here, I am setting up a Sundstrom half-face respirator using a plastic reservoir bag, it works like a NRB mask but the intake and exhaust valves on the respirator seal much better. Since I don't need extra nitrogen to flush out exhaled CO2 as in the exit bag method, can I set the nitrogen rate down to 10 lpm from 15 lpm?
I don't see a lot of discussions about using respirator, is it better than exit bag? Your comments are welcome.
Here are some pics:

 

[ToughLife]

I have some concerns. Since the nitrogen is flowing in constantly, when the reservoir bag is full and the nitrogen keeps coming in, the positive pressure will push open the intake and exhaust valves. When I breath in, would the exhaust valves still stay open due the pressure from the incoming nitrogen? As a result of the open exhaust valves, would the air from the atmosphere that contains oxygen be breathed in as well? Also due to the constant inflow of nitrogen the intake valve stays open, would my exhaled gas that contains CO2 go into the reservoir bag? Please help, I need to know if this will work. I need to ctb soon.

 

[Banshee]

I have some concerns. Since the nitrogen is flowing in constantly, when the reservoir bag is full and the nitrogen keeps coming in, the positive pressure will push open the intake and exhaust valves. When I breath in, would the exhaust valves still stay open due the pressure from the incoming nitrogen? As a result of the open exhaust valves, would the air from the atmosphere that contains oxygen be breathed in as well? Also due to the constant inflow of nitrogen the intake valve stays open, would my exhaled gas that contains CO2 go into the reservoir bag? Please help, I need to know if this will work. I need to ctb soon.

Hard to say. I feel that the expelled gas and CO2 would take the path of less resistance, meaning the escape valve. And if that's the case, it could possibly function as you're looking for. Take that with a grain of salt.

 

[ToughLife]

Thanks @ScambledLiving. Anyone tested the respirator/NRB mask method? I couldn't find much information on this. I am so scared that this is not going to work.