how do I know if the H1 hood - Air Venting System (HAVS) >> is actually working ?

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yaronad

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I've just bought a new : Waterproof H1 3/5mm Hood with Hood Air Venting System (HAVS)
GR8 Hood! ergonomic ...the best I had


The problem is that there is significant portion of air... stuck above my had ?
and the hood is like inflated with air during the dive...
I saw a video of me, diving - and there is air coming out...but not all the time ?


I've tried blowing air from the inside / under the venting system...and there isn't much flow. like blocked?



please advise how the HAVS is actually working? or what am I missing here ?


THX
 
https://www.shearwater.com/products/swift/

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