Vent.. what is the function of this?

Joined
31 Jan 2012
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Location
Lancashire
Country
United Kingdom
I have an air vent to a basement and after heavy rain sometimes water appears from around the vent in the basement. On the outside above the main vent, in the brickwork, are 2 plastic inserts as per the photo attached. I think either water is being blown down the main vent or maybe water ingress is occuring around the plastic inserts... Before I seal around them can anyone tell me why they are present? Thanks
 

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