REGARDS CHINESE HOODS (yellow EEBD type, my pics, Vizzy, those purchased ex-Canada)
Dear members. I should like some opinions and feedback from any of you that have done a test run & examination of this type of hood.
The images attached below show that the cloacal shaped (forgive me, I had to !) inner mask has, aswell as the gas inlet, three one way valves. Below the gas inlet is the major outlet valve which exits into the atmosphere....it is a large a well functioning valve. Flanking the gas inlet are two smaller valves which operate in the opposite direction, permitting air/gas in the hood to enter the inner mask.
During a test run this week, I found the following.
I donned the mask, unfilled with Nitrogen as being made of a fairly robust stitched plastic, it did not permit easy pre-filling as one would do with an exit bag. Having said that, I did not stick it on my crown and attempt to inflate first, rather I tightly bunched the lower flange of the hood until it became clear that this was a mug's game as it simply would not blow up.
The inner mask does fit snugly, although I am tempted to run an extra thick bead of melleable silicone around the nasal bridge area to effect a better seal.
I am considering temporarily blanking off the side valves as I cannot see their purpose given the nitrogen is delivered into the inner mask.
These are not expensive, also in that we are repurposing this product, possibly some adaption is required?
I also found that 40lpm gas delivery cooled down any air starvation.
We have lost some respected members recently, but I'm sure some of you will have welcome opinions. I particuarly would like to hear from those who have done test drives.
Best wishes K1W1
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